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STUDY ON REDUCING THE CORE LOSS OF GRAIN ORIENTED SILICON STEEL AND IMPROVING ITS AGING PROPERTY BY LASER NITRIDING TECHNIQUE IN ATMOSPHERIC AMBIENT 被引量:3
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作者 Y.L. Yang C.S. Liu +1 位作者 F.J. Sun D. Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2005年第4期533-538,共6页
CW-CO2 laser nitriding technique was applied to improve the properties (such as aging property and the core loss) of grain oriented silicon steel. The samples were nitrided with regular space. Laser power density an... CW-CO2 laser nitriding technique was applied to improve the properties (such as aging property and the core loss) of grain oriented silicon steel. The samples were nitrided with regular space. Laser power density and scanning speed were chosen as 7.8×10^5W·cm^-2 and 100mm·min^-1. By some laser irradiation, Fe4N and Fe3N were formed in the nitrided zone. The nitrided samples were annealed at the temperatures ranged from 100 to 90℃. The core loss of some interested samples was tested. The results show that the core loss of the nitrided samples with different thickness of 0.23 and 0.30mm decreased by 14.9% and 9.4% respectively, and the aging property were improved up to 800℃. The mechanism of laser nitriding to improve the properties of grain oriented silicon steel is discussed. 展开更多
关键词 laser nitriding grain oriented silicon steel sheet core loss aging property
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Evolution of Microstructure and Mechanical Property during Long-Term Aging in Udimet 720Li 被引量:6
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作者 Lanzhang ZHOU and Valentino LUPINC CNR-TeMPE, Via R. Cozzi 53, 20125 Milano, Italy Jianting GUO Institute of Metal Research, CAS, 72 Wenhua Road, Shenyang 110016, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第6期633-637,共5页
Thermal stabilities of microstructure and mechanical property have been investigated on superalloy U720Li, which is of great interest of application for jet engine and land-based turbine disc. The results showed that,... Thermal stabilities of microstructure and mechanical property have been investigated on superalloy U720Li, which is of great interest of application for jet engine and land-based turbine disc. The results showed that, the primary and secondary gamma' particles maintain good thermal stability at 650 and 700 degreesC with aging time up to 3000 h, while the tertiary gamma' is apparently dependent on aging temperature and time. The tertiary gamma' particles undergo a procedure of coarsening, dissolution and eventually complete disappearance with the increasing of aging time and temperature. They exhibit unusual high sensibility upon aging temperature, which is attributed to the lattice misfit between the gamma' precipitates and the matrix in the alloy. The grain boundary phase M23C6 remains stable without forming of sigma phase even with aging time up to 3000 h at 700 degreesC. Microhardness decreases apparently with increasing aging time and aging temperature. Theoretical analysis based on dislocation mechanism indicates that the change of microhardness should be attributed to the evolution of the tertiary gamma' during aging. 展开更多
关键词 Evolution of Microstructure and Mechanical property during Long-Term Aging in Udimet 720Li LONG
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Synthesis,Crystal Structure and Fluorescence Property of the Ag(Ⅰ) Coordination Polymer Constructed by 2D[Ag(1,3-BIP)(PMA)_(0.5)]_n^(n-)Layers and 1D[Ag(1,3-BIP)(H_2O)]_n^(n+) Chains 被引量:11
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作者 LU Jiu-Fu GE Hong-Guang SHI Juan 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2015年第8期1259-1264,共6页
A new AgO) coordination polymer, {[Ag(1,3-BIP)(H20)][Ag(1,3- BIP)(PMA)0.5.- 4H20}n (PMA = 1,2,4,5-benzenetricarboxylic acid, 1,3-BIP = 1,3-bis(imidazole)propane), have been synthesized and characterized b... A new AgO) coordination polymer, {[Ag(1,3-BIP)(H20)][Ag(1,3- BIP)(PMA)0.5.- 4H20}n (PMA = 1,2,4,5-benzenetricarboxylic acid, 1,3-BIP = 1,3-bis(imidazole)propane), have been synthesized and characterized by single-crystal X-ray diffraction, powder XRD, FTIR, TGA and elemental analysis techniques. The single-crystal X-ray diffraction reveals that the title complex is formed by 1D polymeric cationic chains of [Ag(1,3-BIP)(H2O)]n^n+ and 2D polymetric anionic layer of [Ag(1,3-BIP)(PMA)0.5]n^n-, which are further linked by intermolecular H-bonding to form a 3D supramolecular framework. In addition, the photoluminescence property of the title complex in the solid state at room temperature was also investigated. 展开更多
关键词 Ag(I) coordination polymer helical chains photoluminescence property
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Damping Property of Supersaturated ZnA127Ce Alloy during Natural Aging
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作者 Jingpei XIE Yaomin ZHU +1 位作者 Yanpei SONG Xiaoying WANG and Quande CHEN Dept.of Material Engineering , Luoyang Institute of Technology, Luoyang 471039. China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第1期9-10,共2页
The microstructures and damping property of supersaturated ZnA127Ce alloy during natural aging have been investigated. H-800 TEM was mainly used to research the microstructures. The relationship between microstructure... The microstructures and damping property of supersaturated ZnA127Ce alloy during natural aging have been investigated. H-800 TEM was mainly used to research the microstructures. The relationship between microstructure and damping property was primarily studied. The results showed that solution plus natural aging was the best heat treatment, which could improve the damping property. Both continuous precipitation and cellular reaction occurred during the aging. Continuous precipitation follows the sequence: β→spherical GP zones→elliptical GP zones→intermediate phase R→n. The cellular reaction can be written as follows:β→a+n+ε. 展开更多
关键词 CE Damping property of Supersaturated ZnA127Ce Alloy during Natural Aging
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Influence of Deposition Temperature and Pressure on Microstructure and Tribological Properties of Arc Ion Plated Ag Films 被引量:2
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作者 HU Ming GAO Xiaoming +3 位作者 SUN Jiayi WENG Lijun ZHOU Feng LIU Weimin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2012年第4期838-844,共7页
The films deposited at low temperature(LT-films) have increasingly attracted theoretical and technical interests since such films exhibit obvious difference in structure and performances compared to those deposited ... The films deposited at low temperature(LT-films) have increasingly attracted theoretical and technical interests since such films exhibit obvious difference in structure and performances compared to those deposited at room temperature.Studies on the tribological properties of LT-films are rarely reported in available literatures.In this paper,the structure,morphology and tribological properties of Ag films,deposited at LT(166 K) under various Ar pressures on AISI 440C steel substrates by arc ion plating(AIP),are studied by X-ray diffraction(XRD),atomic force microscopy(AFM) and a vacuum ball-on-disk tribometer,and compared with the Ag films deposited at RT(300 K).XRD results show that(200) preferred orientation of the films is promoted at LT and low Ar pressure.The Crystallite sizes are 70 nm-80 nm for LT-Ag films deposited at 0.2 Pa and 0.8 Pa and larger than 100 nm for LT-Ag films deposited at 0.4 Pa and 0.6 Pa,while they are 55 nm-60 nm for RT-Ag films deposited at 0.2 Pa-0.6 Pa and 37 nm for RT-Ag films deposited at 0.8 Pa.The surfaces of LT-Ag films are fibre-like at 0.6 Pa and 0.8 Pa,terrace-like at 0.4 Pa,and sphere-like at 0.2 Pa,while the surfaces of RT-Ag films are composed of sphere-like grains separated by voids.Wear tests reveal that,due to the compact microstructure LT-Ag films have better wear resistances than RT-Ag film.These results indicate that the microstructure and wear resistance of Ag films deposited by AIP can be improved by low temperature deposition. 展开更多
关键词 low temperature Ag films structure tribological properties
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Electroneutral Quaternization/Sulfosuccination for Alleviating the Adverse Effect of Paste Aging on the Properties of Corn Starch Film 被引量:3
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作者 李伟 祝志峰 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第2期482-490,共9页
For the purpose of alleviating the adverse effect of paste aging on the properties of corn starch film, a series of electroneutrally quaternized/sulfosuccinylated starches(EQSS) with different degrees of substitutio... For the purpose of alleviating the adverse effect of paste aging on the properties of corn starch film, a series of electroneutrally quaternized/sulfosuccinylated starches(EQSS) with different degrees of substitution(DS) were synthesized via the quaternization/sulfosuccination of acid-thinned corn starch(ATS) by varying the amounts of N-(3-chloro-2-hydroxypropl) trimethylammonium chloride, maleic anhydride, and sodium hydrogen sulfite. The influence of paste aging on the properties of starch film cast from heat-induced starch paste was investigated and the properties were explored in terms of tensile strength, elongation, work at break, degree of crystallinity, and flex-fatigue resistance. The experimental results showed that the paste ageing generated adverse influence on the elongation, work at break, and flex-fatigue resistance of starch film. Further experiments showed that electroneutral quaternization/sulfosuccination of starch were able to alleviate the negative effect of paste ageing on the elongation, work at break, and flex-fatigue resistance, thereby obviously enhancing the elongation, work at break and flex-fatigue resistance, and thus reducing the drawback of brittleness. The enhancement depended on the amounts of the substituents introduced. With the increase in DS value, the elongation and work at break as well as flex-fatigue resistance continuously rose, whereas the tensile strength gradually reduced. 展开更多
关键词 starch film ageing starch paste electroneutral quaternization/sulfosuccination tensile properties
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Effect of aging temperature on the microstructures and mechanical properties of ZG12Cr9Mo1Co1NiVNbNB ferritic heat-resistant steel 被引量:1
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作者 Xue Yang Lan Sun +3 位作者 Ji Xiong Ping Zhou Hong-yuan Fan Jian-yong Liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第2期168-175,共8页
The effect of aging on the mechanical properties and microstructures of a new ZG12Cr9 MolColNiVNbNB ferritic heat resistant steel was investigated in this work to satisfy the high steam parameters of the ultra-supercr... The effect of aging on the mechanical properties and microstructures of a new ZG12Cr9 MolColNiVNbNB ferritic heat resistant steel was investigated in this work to satisfy the high steam parameters of the ultra-supercritical power plant.The results show that the main precipitates during aging are Fe(Cr,Mo)23C6,V(Nb)C,and(Fe2Mo) Laves in the steel.The amounts of the precipitated phases increase during aging,and correspondingly,the morphologies of phases are similar to be round.Fe(Cr,Mo)23C6 appears along boundaries and grows with increasing temperature.In addition,it is revealed that the martensitic laths are coarsened and eventually happen to be polygonization.The hardness and strength decrease gradually,whereas the plasticity of the steel increases.What's more,the hardness of this steel after creep is similar to that of other 9%-12%Cr ferritic steels.Thus,ZG12Cr9 MolColNiVNbNB can be used in the project. 展开更多
关键词 heat resistant steel aging temperature precipitates microstructure mechanical properties
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Microstructure and Performance Analysis of Organic Coating under High Temperature and High CO_2 Partial Pressure
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作者 李琼伟 ZHANG Jianxun +2 位作者 LI Mingxing XI Yuntao ZHANG Zhengyun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第6期1181-1186,共6页
To evaluate the property of the organic coatings in oil and gas plants, the aging process was studied in high temperature and high CO_2 partial pressure environment. Correlations were developed between the macroscopic... To evaluate the property of the organic coatings in oil and gas plants, the aging process was studied in high temperature and high CO_2 partial pressure environment. Correlations were developed between the macroscopic properties and microstructure of the organic coatings. The surface appearance, mechanical properties, and permeability of the organic coatings were measured. Furthermore, the crystal structure of the organic coatings was investigated through synchrotron radiation grazing incidence X-ray diffraction(GIXRD) on the BL14B1 beam line in Shanghai Synchrotron Radiation Facility. Combined with the Fourier transform infrared spectroscopy, the molecular structure of the organic coatings was investigated. The experimental results indicate that the thickness variation and weight loss of the organic coatings increase with the immersion time, and the penetration resistance of the coating obviously decreases as the temperature rises. Moreover, the degradation of the organic coatings with immersion time in high temperature and high CO_2 partial pressure environment is caused by the amorphization of the organic coatings as the groups and bonds of the organic coatings were not damaged. 展开更多
关键词 coating aging process microstructure mechanical property permeability
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Thermoelectric Properties of Ag-doped In_4Se_(2.95) Polycrystalline Compounds
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作者 陈燕春 刘鹏飞 +1 位作者 陈玲 吴立明 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第12期1868-1875,共8页
In_4Se_3-based materials are noticeable n-type thermoelectric materials because of lead-free and intrinsically low lattice thermal conductivity,but the In4Se_3-δ crystals(with Se-deficiency,δ) suffer strong anisot... In_4Se_3-based materials are noticeable n-type thermoelectric materials because of lead-free and intrinsically low lattice thermal conductivity,but the In4Se_3-δ crystals(with Se-deficiency,δ) suffer strong anisotropy and cleavage habit. Thus the researches on polycrystalline In_4Se_3-based materials are of great importance. Herein,we experimentally and theoretically investigated the thermoelectric properties of In_(4-x)Se_(2.95)Ag_x polycrystalline compounds. Ag occupying the intercalation or In4 site is energetically most favorable in light of the density functional theory calculation. The maximum solubility of Ag(x_m) is very low(xm 〈 0.03) and the experimental result indicates that the electrical transport behavior of In_(4-x)Se_(2.95)Ag_x compounds is not significantly optimized by Ag-dopant. Consequently,a maximum ZT of 0.92 at 723 K is obtained by In_(3.98)Se_(2.95)Ag_(0.02) compound that represents 15% enhancement over that of the un-doped one which benefits from the slightly enhanced power factor and the reduced total thermal conductivity. 展开更多
关键词 In4Se2.95 Ag doping thermoelectric property
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Effect of Ageing at 700℃ on Microstructure and Mechanical Properties of S31042 Heat Resistant Steel 被引量:10
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作者 WANG Jing-zhong LIU Zheng-dong +2 位作者 BAO Han-sheng CHENG Shi-chang WANG Bin 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第4期54-58,共5页
To investigate the effect of high temperature ageing on the microstructure and mechanical properties of S31042steel,solid solution treatment at 700℃ was carried out for various time from 10to 6 000h.Experimental resu... To investigate the effect of high temperature ageing on the microstructure and mechanical properties of S31042steel,solid solution treatment at 700℃ was carried out for various time from 10to 6 000h.Experimental results showed that the change of mechanical properties is closely related to the amount of precipitated phases.During ageing from 10to 300h,precipitation in the tested steel increases rapidly,and correspondingly,the high temperature yield strength and room temperature hardness of tested steel increase rapidly.Meanwhile,the thickness of the secondary phase on grain boundaries widens sharply and the room temperature Charpy impact absorb energy decreases.Ageing beyond 300h,the precipitation in the steel increases gradually and the precipitates coarsen to a certain extent.The high temperature yield strength of the steel keeps stable,and the room temperature Charpy impact energy and hardness decrease slowly.Ageing beyond 3 000h,the mechanical properties of the steel tend to be stable.The main precipitates are M23C6,NbCrN and NbC in the tested steel. 展开更多
关键词 ageing microstructure mechanical property precipitated phase
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Mechanism of Cu(Ⅱ) adsorption inhibition on biochar by its aging process 被引量:21
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作者 Yue Guo Wei Tang +2 位作者 Jinggui Wu Zhaoqin Huang Jingyu Dai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第10期2123-2130,共8页
Biochar exposed in the environment may experience a series of surface changes, which is called biochar aging. In order to study the effects of biochar aging on Cu(Ⅱ) adsorption, we analyzed the surface properties b... Biochar exposed in the environment may experience a series of surface changes, which is called biochar aging. In order to study the effects of biochar aging on Cu(Ⅱ) adsorption, we analyzed the surface properties before and after biochar aging with scanning electron microscopy(SEM) coupled to an energy-dispersive X-ray spectrometer(EDX) and diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS), and then explored the influence of the aging process on Cu(Ⅱ) adsorption by batch experiments. After the aging process, the oxygen concentration, phenolic hydroxyl groups, aromatic ethers and other oxygen-containing functional groups on the biochar surface increased, while carboxyl groups slightly decreased. Thus, over a range of pH, the cation exchange capacity(CEC) and adsorption capacity of Cu(Ⅱ) on the aged biochar were smaller than those of new biochar,indicating that when biochar is incubated at constant temperature and water holding capacity in the dark, the aging process may inhibit Cu(Ⅱ) adsorption. Meanwhile, the dissociation characteristics of oxygen-containing functional groups changed through the aging process, which may be the mechanism by which the biochar aging process inhibits the Cu(Ⅱ) adsorption. Carboxyl groups became more easily dissociated at low pH(3.3–5.0),and the variation of maximum adsorption capability(qm) of Cu(Ⅱ) on the old biochar was enlarged. Phenolic hydroxyl groups increased after the aging, making them and carboxyl groups more difficult to dissociate at high pH(5.0–6.8), and the variation of qmof Cu(Ⅱ) on the aged biochar was reduced. 展开更多
关键词 Biochar Aging Surface property Adsorption Cu(Ⅱ)
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Microstructure Evolution and Mechanical Properties of HR3C Steel during Long-term Aging at High Temperature 被引量:15
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作者 Bin WANG Zheng-dong LIU +2 位作者 Shi-chang CHENG Chun-ming LIU Jing-zhong WANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2014年第8期765-773,共9页
Microstructure evolution and the changes in mechanical properties of HR3 Csteel during long-term aging at650,700 and 750℃ were investigated.The precipitated phases of the aging steel included M23C6 carbides,Z-phase a... Microstructure evolution and the changes in mechanical properties of HR3 Csteel during long-term aging at650,700 and 750℃ were investigated.The precipitated phases of the aging steel included M23C6 carbides,Z-phase and a trace amount of Nb(C,N).The M23C6 carbides were distributed mainly at the grain boundary,while Z-phase was mainly inside the grains.Amounts of both M23C6 carbides and Z-phase during the aging process increased with increasing aging period and temperature.Coarsening of M23C6 carbides was influenced significantly by aging time and temperature,while the size of the Z-phase was relatively less affected by the aging time and temperature,which had a steady strengthening effect.Coarsening of the M23C6 carbides was the main reason for the decline in high temperature yield strength during long-term aging at 750℃.The M23C6 carbides were linked into a continuous chain along the grain boundary which accounted for the decrease of toughness during aging. 展开更多
关键词 HR3C steels microstructure evolutions mechanical propertys aging
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Effect of Different Aging Processes on the Microstructure and Mechanical Properties of a Novel Al–Cu–Li Alloy 被引量:8
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作者 Hongying Li Desheng Huang +3 位作者 Wei Kang Jiaojiao Liu Yangxun Ou Dewang Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第10期1049-1053,共5页
The effects of different aging processes on the microstructure and mechanical properties of a novel Al-Cu-Li alloy have been investigated by X-ray diffraction, scanning electron microscopy and transmission electron mi... The effects of different aging processes on the microstructure and mechanical properties of a novel Al-Cu-Li alloy have been investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It is found that the tensile properties of a novel Al-Cu-Li alloy are sensitive to aging processes, which correspond to different microstructures. σ(Al_5Cu_6Mg_2) and T_1(Al_2CuLi) phases are the major precipitates for the alloy in T6 aging condition(165 ℃/60 h). After duplex aging condition(150 ℃/24 h + 180 ℃/12 h), σ, θ'(Al_2Cu) and T_1 phases are detected. Only the T_1 phases can be found in the T8 state alloy(6% pre-strain+135 ℃/60 h). The failure modes of alloy in T6 and duplex aging conditions are dimple-intergranular fracture, while typical quasi-cleavage fracture in T8 condition. 展开更多
关键词 Al-Cu-Li alloy Aging process Microstructure Mechanical properties
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Effect of Hf on Stress Rupture Properties of DD6 Single Crystal Superalloy After Long Term Aging 被引量:4
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作者 SHI Zhen-xue LI Jia-rong LIU Shi-zhong 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2012年第7期66-70,共5页
The specimens of the second generation single crystal superalloy DD6 with different Hf contents were prepared in the directionally solidified furnace with a high temperature gradient. The long term aging of the specim... The specimens of the second generation single crystal superalloy DD6 with different Hf contents were prepared in the directionally solidified furnace with a high temperature gradient. The long term aging of the specimens after full heat treatment was performed at 1040℃for 800 h. The effect of Hf on the microstructure and stress rupture properties under 980℃/250 MPa of the alloy after long term aging was investigated. The results show that the γ' coarsening and rafting and no topologically close packed phase (TCP) are observed in the microstructures of DD6 alloy with different Hf contents after aged at 1 040℃ for 800 h. It indicates that DD6 alloy with different Hf contents all possesses good microstructure stability. With increasing Hf content the rupture life after long term aging turns shorter and the elongation represents the increasing first and decreasing afterwards. The fracture mechanism of the alloy with different Hf contents at 980℃/250 MPa all shows dimple model. The influence of the microstructures on the stress rupture properties of the alloy is also discussed. 展开更多
关键词 DD6 single crystal superalloy stress rupture property long term aging
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Accelerated precipitation behavior of cast Mg-Al-Zn alloy by grain refinement 被引量:5
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作者 Sang-Hoon Kim Jong Un Lee +3 位作者 Ye Jin Kim Jun Ho Bae Bong Sun You Sung Hyuk Park 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第2期265-276,共12页
This study demonstrates that the precipitation behavior of 13-Mg17Al12 phase during aging and the resultant variation in hardness and mechanical properties of cast Mg-Al-Zn alloy are strongly dependent on initial grai... This study demonstrates that the precipitation behavior of 13-Mg17Al12 phase during aging and the resultant variation in hardness and mechanical properties of cast Mg-Al-Zn alloy are strongly dependent on initial grain size. Grain size reduction accelerates discontinuous precipitation at the early stage of aging treatment by increasing the area fraction of grain boundaries that can act as nucleation sites for discontinuous precipitates (DP), but it does not influence DP growth rate. Grain refinement also prematurely terminates continuous precipitation because the formation of a large number of DP reduces the amount of AI dissolved in the matrix, which is required for the formation of continuous precipitates (CP). This promotion of DP formation and early termination of CP formation significantly decrease the peak-aging time to one-third. The enhanced precipitation behavior also leads to an additional hardness improvement in the aged alloy, along with an increase in hardness owing to grain boundary strengthening by grain refinement. The amount of increase in hardness changes with aging time, which is determined by the variation of three variables with aging time: DP fraction difference between refined and nonrefined alloys, hardness difference between DP and matrix, and matrix hardness difference between the two alloys. Grain refinement improves both tensile strength and ductility of the homogenized alloy owing to grain boundary strengthening and suppression of twinning activation, respectively. However, the loss of ductility after peak-aging treatment is greater in the refined alloy because of the larger amount of DP acting as a crack source in this alloy. 展开更多
关键词 Magnesium Grain refinement Aging Precipitation Tensile properties
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Precipitation Behavior of Cu-1.9Be-0.3Ni-0.15Co Alloy During Aging 被引量:5
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作者 Yan-Chuan Tang Yong-Lin Kang +1 位作者 Li-Juan Yue Xiao-Liang Jiao 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第3期307-315,共9页
In this paper,the evolutions of microstructure and mechanical properties of Cu-l.9Be-0.3Ni-0.15Co alloy were studied.The alloys in the condition of the solution treated(soft state) and 37% cold rolled(hard state) ... In this paper,the evolutions of microstructure and mechanical properties of Cu-l.9Be-0.3Ni-0.15Co alloy were studied.The alloys in the condition of the solution treated(soft state) and 37% cold rolled(hard state) were aged at 320 ℃for different time,respectively.The mechanical properties,electrical conductivity and microstructure of the alloy aged for different time were analyzed.Additionally,the precipitation kinetics of Cu-1.9Be-0.3Ni-0.15Co alloys was investigated.X-ray diffraction and transmission electron microscopy results reveal that both continuous precipitation and discontinuous precipitation existed in the hard-state Cu-l.9Be-0.3Ni-0.15Co alloy during the whole aging process;the sequence of continuous precipitation is G.P.zone →γ″→γ′→γ.Furthermore,the precipitation transformation mechanism of softstate alloy is homogeneous nucleation,while hard-state alloy shows the heterogeneous nucleation(interface nucleation)with the nucleation rate of both states decaying rapidly to zero during aging at 320 ℃. 展开更多
关键词 Cu-1.9Be-0.3Ni-0.15Co alloy Aging Microstructure Mechanical property Electrical property Precipitation kinetics
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Long-term thermal-aging stability of oxide-dispersion-strengthened ferritic steels at 753 K 被引量:1
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作者 Shuai Xu Zhang-jian Zhou +1 位作者 Shao-fu Li Hao-dong Jia 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第7期776-784,共9页
Oxide-dispersion-strengthened (ODS) ferritic steels are promising candidates for structural applications in the future nuclear reactors. The higher chromium contents of ODS ferritic steels, the better the corrosion ... Oxide-dispersion-strengthened (ODS) ferritic steels are promising candidates for structural applications in the future nuclear reactors. The higher chromium contents of ODS ferritic steels, the better the corrosion resistance, which can meet the harsh corrosion environment of the advanced reactors. However, increasing the Cr content may also lead to the brittleness of the ODS steels when serving at high temperatures. The ODS ferritic steels with different Cr contents (12, 16 and 18 wt% Cr, respectively) were fabricated by mechanical alloying, hot isostatic pressing and forging. Mechanical properties and microstructure evolution of the ODS ferritic steels after aging at 753 K for 2000 h were investigated. It is found that both Vickers hardness and yield strength of 18%Cr ODS ferritic steel were strongly increased and the impact energy was decreased after aging at 753 K. In order to explore the reasons for changes in the mechanical properties, the fracture surfaces were characterized by scanning electron microscopy, and microstructures after aging were observed by transmission electron microscopy. The impact fracture of 18%Cr ODS ferritic steel belongs to quasi-cleavage facture, which is consistent with its very low impact energy. The grain size and dispersed oxide particles of different ODS steels are very stable. M23C6 carbide and M2C carbide were found in 12%Cr ODS steel and 16%Cr ODS steels, respectively. 展开更多
关键词 Oxide-dispersion-strengthened ferritic steel Aging stability - Mechanical property Microstructure
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Microstructure Evolution and Mechanical Properties of Spray-deposited Al-21.47Si-4.73Fe-2.5Cu-0.9Mg Alloy 被引量:1
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作者 Yan-dong JIA Fu-yang CAO +3 位作者 Pan MA Jing-shun LIU Jian-fei SUN Gang WANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第1期14-18,共5页
Al-Si-Fe-Cu-Mg alloy was prepared by spray deposition and was further processed by hot extrusion as well as T6heat-treatment.The results indicate that the microstructure of the deposited alloy is composed of primary S... Al-Si-Fe-Cu-Mg alloy was prepared by spray deposition and was further processed by hot extrusion as well as T6heat-treatment.The results indicate that the microstructure of the deposited alloy is composed of primary Si particles with average size of less than 5μm,α-Al,Al_2CuMg,β-Al_5FeSi andδ-Al_4FeSi_2(rectangular shape),and no eutectic silicon is found due to the special solidification behavior.The age hardening curves reveal two peaks.The uniform ultimate tensile strength(UTS)and the elongation of the peak-aged Al-Si-Fe-Cu-Mg alloy are 468.3 MPa,0.61% at 298 Kand 267.4MPa,6.42% at 573 K,respectively.The fracture surfaces display brittle fracture morphology at 298 K,whereas it varies to mixture of brittle and ductile failure with increasing the temperature. 展开更多
关键词 spray deposition hypereutectic Al-Si alloy microstructure aging mechanical property
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Microstructure and Mechanical Properties of a Spray-Formed Superalloy 被引量:1
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作者 Fuwei Kang Fuyang Cao +2 位作者 Xuemin Zhang Hongyan Yue Yicheng Feng 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第6期1063-1069,共7页
The microstructural evolution and mechanical properties of a spray-formed superalloy were studied in this paper. Based on a better understanding of the microstructural evolution of the spray-formed superalloy during s... The microstructural evolution and mechanical properties of a spray-formed superalloy were studied in this paper. Based on a better understanding of the microstructural evolution of the spray-formed superalloy during solution treatment, an optimum solution treatment process was obtained, namely, at 1,140 °C for 6 h, and air cooling(AC). The effects of the ageing treatments on the mechanical properties of the post-solution-treated spray-formed superalloy were evaluated using ageing harden curves and tensile testing. The results indicated that the maximum hardness value was achieved at 850 °C for 8 h, AC. Due to co-precipitation of primary and secondary c0 precipitates during the heat treatment,the spray-formed superalloy obtained an excellent combination of yield strength(YS = 1,110 MPa), ultimate tensile strength(UTS = 1,503 MPa), ductility(elongation, EL = 21%) and excellent stress rupture properties at 650 °C(UTS = 1,209 MPa, EL = 15.8%). The heat treatment also improved the rupture life at 650 °C/950 MPa and 750 °C/539 MPa up to 140 h without rupturing. The tensile-fractured surfaces exhibit ductile transgranular failure feature. The optimum heat treatment process was determined to be 1,140 °C/6 h+850 °C/8 h+AC. 展开更多
关键词 Spray-formed superalloy Microstructure ageing harden Mechanical properties
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Controllable magnetic properties of cobalt ferrite particles derived from layered double hydroxide precursors 被引量:1
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作者 Yonglian Qi Yingsheng Yang +4 位作者 Xiaofei Zhao Xilan Liu Peng Wu Fazhi Zhang Sailong Xu 《Particuology》 SCIE EI CAS CSCD 2010年第3期207-211,共5页
Cobalt ferrite CoxNi1-xFe2O4 (x = 0, 0.5, 1 ) particles with controllable magnetic properties have been prepared by calcination of co-substituted NiFe^2+Fe^3+ -layered double hydroxide (NiFe^2+Fe^3+-LDH) precu... Cobalt ferrite CoxNi1-xFe2O4 (x = 0, 0.5, 1 ) particles with controllable magnetic properties have been prepared by calcination of co-substituted NiFe^2+Fe^3+ -layered double hydroxide (NiFe^2+Fe^3+-LDH) precursors prepared via a scalable method involving separate nucleation and aging steps (SNAS). Their structural and magnetic characteristics were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). Measurements of magnetic properties show that the saturation magnetization (Ms) and coercivity (He) of the calcined products increased with increasing cobalt content. The LDH precursor-based product obtained by calcination of a mixture of CoFe^2+Fe3^+-LDH and NiFe^2+Fe^3+ -LDH powders with a Co/Ni molar ratio of 1:1, exhibits a moderate value of Ms and an increased value of He compared to the corresponding values for an Ni0.5Co0.5Fe2O4 material prepared by calcination of a Co0.5Ni0.5Fe^2+Fe^3+-LDH precursor, and a physical mixture of CoFe2O4 and NiFe2O4 with a Co/Ni molar ratio of 1 : 1. These results may provide a way to regulate magnetic anisotropy of ferrite spinels by varying the composition of the LDH precursors. 展开更多
关键词 Layered double hydroxide precursor Cobalt ferrite Separate nucleation and aging steps Magnetic properties
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