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Microstructure and Properties of Cu-Cr-Zr Alloy after Rapidly Solidified Aging and Solid Solution Aging 被引量:14
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作者 Ping LIU Juanhua SU +1 位作者 Qiming DONG Hejun LI 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第4期475-478,共4页
The structure and properties of Cu-Cr-Zr alloy were studied after rapidly solidified aging and solid solution aging.At the early stage of aging (500℃ for 15 rain), the hardness and the conductivity of the alloy rap... The structure and properties of Cu-Cr-Zr alloy were studied after rapidly solidified aging and solid solution aging.At the early stage of aging (500℃ for 15 rain), the hardness and the conductivity of the alloy rapidly solidified are 143 HV and 72% IACS, respectively. Under the same aging condition, the hardness and electrical conductivity of the alloy solid solution treated can reach 86 HV and 47% IACS, respectively. The microstructure was analyzed, and the grain size after rapid solidification is much smaller than that after solid solution treatment. By rapidly solidified aging the fine precipitates distribute inside the grains and along the grain boundary, while by solid solution aging there are large Cr particles along the grain boundary. 展开更多
关键词 Cu-Cr-Zr alloy PROPERTIES Solid solution aging rapidly solidified aging
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Microstructure and thermal stability behavior of a rapidly solidified Al-Ti-Fe-Cr alloy 被引量:3
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作者 CHEN Yiqing, CAO Qingping, and SU YongSchool of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China 《Rare Metals》 SCIE EI CAS CSCD 2002年第3期207-212,共6页
A rapidly solidified Al-2.5Ti-2.5Fe-2.5Cr (mass fraction in percent) alloywas prepared by melt spinning. As-quenched and as-annealed microstructures were studied by X-raydiffractometry (XRD), transmission electron mic... A rapidly solidified Al-2.5Ti-2.5Fe-2.5Cr (mass fraction in percent) alloywas prepared by melt spinning. As-quenched and as-annealed microstructures were studied by X-raydiffractometry (XRD), transmission electron microscopy (TEM), high-resolution transmission electronmicroscopy (HREM) and energy dispersive spectrum (EDS) analysis. The microhardness of the alloy atdifferent annealing temperatures was measured. The results obtained indicate that the microhardnessof the rapidly solidified Al-2.5Ti-2.5Fe-2.5Cr alloy does not vary with different annealingtemperatures. The as-quenched microstructure of the alloy includes two kinds of dispersed primaryphases: Al_3Ti and Al_(13)(Cr, Fe)_2. After annealing at 400 deg C for 10 h, the stable phaseAl_(13)Fe_4 appears in the microstructure. 展开更多
关键词 rapidly solidified Al-Ti-Fe-Cr alloy MICROHARDNESS as-quenchedmicrostructure as-annealed microstructure
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Effects of Additional Elements on Microstructure and Precipitation Behaviour in Rapidly Solidified Al-Ti Base Alloys 被引量:3
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作者 Won-Wook Park Chul-Jin Choi and Bong-Sun You (Dept. of Materials Processing, Korea Institute of Machinery and Metals, 66 Sangnam-Dong,Changwon, Kyungnam, Korea 641-010)(To whom correspondence should be addressed) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1996年第3期195-198,共4页
Rapidly solidified Al-Ti base alloys were prepared by melt spinning at the cooling rate about 107 K/s. The melt-spun ribbons were used to observe the dricrostructures after heat treatment.In the supersaturated Al-Tl-S... Rapidly solidified Al-Ti base alloys were prepared by melt spinning at the cooling rate about 107 K/s. The melt-spun ribbons were used to observe the dricrostructures after heat treatment.In the supersaturated Al-Tl-Si alloy, age hardening occurred after 1 h anneal in the temperature range of 4000~500℃, which seems to be attributed to the precipitation of metastable Ll2- (Al,Si)3Ti phase. However. the microhardness was relatively low because of the low v/o and the insufflcient stability of precipitates. Thus. Cr was added to Al-Ti-Si alloys in order to stabilize the microstructures and to increase the v/o of precipitate5. As a result. the alIoys containing Cr were evaluated to possess the improved properties at the service temperature. 展开更多
关键词 Ti BASE Al Effects of Additional Elements on Microstructure and Precipitation Behaviour in rapidly Solidified Al-Ti Base Alloys
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Microstructures of FeSi_2 based thermoelectric materials prepared by rapid solidification and hot pressing 被引量:3
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作者 HaiyanChen XinbingZhao +3 位作者 EckhardMueller YufengLu CestmirDrasar AntjeMrotzek 《Journal of University of Science and Technology Beijing》 CSCD 2004年第1期67-70,共4页
FeSi_2 based thermoelectric materials have heen prepared by melt spinning andvacuum hot pressing. Most of the rapidly solidified (melt spinning) powders are thin flakes with athickness less than 0.1 mm. Scanning elect... FeSi_2 based thermoelectric materials have heen prepared by melt spinning andvacuum hot pressing. Most of the rapidly solidified (melt spinning) powders are thin flakes with athickness less than 0.1 mm. Scanning electron microscope (SEM) surface profiles show there arefurther finer grain structures with the characteristic size of about 100 nm in a flake. The samplesobtained by hot uniaxial pressing (HUP) in vacuum have densities higher than 90% the theoreticaldensity of the materials. It was found by SEM observations that the microstructures are verydifferent for vertical and parallel sections of the HUP samples. X-ray diffraction (XRD) analysesshow there are some texture features in the samples. It is considered that the textures of thesamples are originated from the orientation of the flakes that tended to align perpendicular to thehot press axis. WSi_2 was introduced into the powders unexpectedly during melting process before therapid solidification, but it makes the microstructures more easily to be explained. 展开更多
关键词 FeSi_2 melt spinning rapidly solidified hot uniaxial pressing microstructure
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Positron Annihilation Study on the Microstructural Stability in Rapidly Solidified Al_(92.3)Fe_(4.3)V_(0.7)Si_(1.7)Mm_(1.0) Alloy 被引量:1
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作者 Wei JIA Meikuang Tseng and Jianqiang WANG(Dept. of Material Science, Northeastern University Shenyang 110006, China)Liangyue XIONG and Yelong CHU(International Ceoter for Materials Physics, Institute of Metal Research, Chinese Academy of Sciences,Shenyan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1998年第2期179-181,共3页
Rapidly solidified Al92.3Fe4.3V0.7Si1.7Mm1.0 alloy has been studied by positron lifetime spectroscopy and the variations on the intedecial defects with the annealing temperature were revealed by an analysis of the lif... Rapidly solidified Al92.3Fe4.3V0.7Si1.7Mm1.0 alloy has been studied by positron lifetime spectroscopy and the variations on the intedecial defects with the annealing temperature were revealed by an analysis of the lifetime results. The intedece characteristics derived from the positron-lifetime results could be used to give a satisfactory interpretation of the dependence of mechanical properties on the annealing temperature 展开更多
关键词 FE Positron Annihilation Study on the Microstructural Stability in rapidly Solidified Al MM SI
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Investigation on Rapidly Solidified T15 High Speed Steel Powder and Its Bulk Microcrystalline Material
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作者 Yu Hui Ding Fuchang +2 位作者 Wang Enke V.N.DiGiambattista Qi Jiazhong 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 1996年第1期24-28,共5页
Authors produced rapidly solidified T15 high speed steel powders by high pressure(5~ 6MPa) N_a atomization and liquid N_2 cooling,observed and analyzed the morphology and structure of the powders;at the same time,prep... Authors produced rapidly solidified T15 high speed steel powders by high pressure(5~ 6MPa) N_a atomization and liquid N_2 cooling,observed and analyzed the morphology and structure of the powders;at the same time,prepared bulk microcrystalline T15 high speed steel materials by hot extruding or HIPing and hot rolling of the powders,observed and measured the microstructure and performance of the bulk materials.It was shown that rapid solidification may change the solidification characteristics and structure of T15 high speed steel powder and improve the qualities and properties of T15 high speed steel materials. 展开更多
关键词 rapidly solidified powder high speed steel bulk microcrystalline material microstructure performance
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Rapid Application of Neural Networks and A Genetic Algorithms to Solidified Aging Processes for Copper Alloy
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作者 苏娟华 刘平 +1 位作者 董企铭 李贺军 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第S1期464-467,共4页
Rapidly solidified aging is an effective way to refine the microstructure of Cu-Cr-Sn-Zn lead frame alloy and enhance its hardness. The artificial neural network methodology(ANN) along with genetic algorithms were use... Rapidly solidified aging is an effective way to refine the microstructure of Cu-Cr-Sn-Zn lead frame alloy and enhance its hardness. The artificial neural network methodology(ANN) along with genetic algorithms were used for data analysis and optimization. In this paper the input parameters of the artificial neural network (ANN) are the aging temperature and aging time. The outputs of the ANN model are the hardness and conductivity properties. Some explanations of these predicted results from the microstructure and precipitation-hardening viewpoint are given. After the ANN model is trained successfully, genetic algorithms(GAs) are applied for optimizing the aging processes parameters. 展开更多
关键词 copper alloy rapidly solidified aging artificial neural network genetic algorithm
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MICROSTRUCTURE AND DUCTILITY OF RE DOPED RAPIDLY SOLIDIFIED NiAl
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作者 SUN Baode LIN Dongliang +1 位作者 YANG Gencang ZHOU Yaohe 1)Shanghai Jiao Tong University, Shanghai,China)2)Northwesten Polytechnic University,Xi’an,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1995年第2期106-109,共4页
The paper investigated the effects of RE on the microstructure and ductility of melt-spun Al-63.3at.%Ni and Al-66.4at%Ni.For Al-63.3at.%Ni without RE the microstructure is a mixture of equiaxed martensitic grains and ... The paper investigated the effects of RE on the microstructure and ductility of melt-spun Al-63.3at.%Ni and Al-66.4at%Ni.For Al-63.3at.%Ni without RE the microstructure is a mixture of equiaxed martensitic grains and B2 NiAl grains,but after addition of 0.2wt% RE a complete supersaturated B2 NiAl results,and its elongation is enhanced from 0.9%(without RE) to 1.4%(with 0.2wt%RE).For Al-66.4at.%Ni without RE the microstructure is coarse equiaxed martensitic grains with Ni3Al precipitated at the GBs.But complete martensitic grains and supersaturated single phase,B2 NiAl,would result with addition of 0.05wt%RE and 0.2-0.8wt%RE respectively.The elongation of Al-66.4at.%Ni without RE is only 0.8%.With the addition of 0.05, 0.2 and 0.8wt%RE.the elongation can reach 2.6,3.0 and 3.2% respectively.The addition of RE can change the fracture mode from intergranular fracture(without RE) to a mixture of intergranular and transgranular fracture or entirely transgranular fracture.The mechanisms of microstructure formation and ductility enhancement are analyzed. 展开更多
关键词 NIAL rare earth element rapidly solidified alloy DUCTILITY
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AgNi15 composite particles prepared by ultrasonic arc spray atomization method
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作者 谢建斌 温春明 +2 位作者 秦国义 许思勇 郭锦新 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3556-3561,共6页
Ultrasonic arc spray atomization (UASA) method was used to prepare high-melting-point, immiscible AgNi15 (mass fraction, %) composite particles. Sieving was used to determine the size distribution of the AgNi15 partic... Ultrasonic arc spray atomization (UASA) method was used to prepare high-melting-point, immiscible AgNi15 (mass fraction, %) composite particles. Sieving was used to determine the size distribution of the AgNi15 particles. The morphology, rapidly solidified structure and metastable solution expansion of the AgNi15 particles were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS), respectively. The results show that the AgNi15 composite particles are spherical and well-dispersed, and the mass fractions of the particles with diameters <74μm and <55 μm are 99.5% and 98%, respectively. The rapidly solidified structure of the AgNi15 particles consists of spherical nickel-richβ(Ni)-phase particles dispersed throughout a silver-richα(Ag)-phase matrix andα(Ag)-phase nanoparticles dispersed throughout largerβ(Ni)-phase particles. The silver and nickel in the AgNi15 particles form a reciprocally extended metastable solution, and the solid solubility of nickel in the silver matrix at room temperature is in the range of 0.16%?0.36% (mole fraction). 展开更多
关键词 AgNi15 composite particle ultrasonic arc spray atomization rapidly solidified structure metastable solution extension
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Influence of Neodymium on Amorphizability of RS Al-Fe-V-Si-Nd Alloys:An Investigation Using Time Dependent Nucleation Theory
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作者 庞华 郑立净 +1 位作者 张宝金 曾梅光 《Journal of Rare Earths》 SCIE EI CAS CSCD 2000年第4期293-297,共5页
Time dependent nucleation theory was applied to calculate the incubation time required for α Al nucleation in rapid solidified (RS) Al Fe V Si Nd alloys. The nucleation rates were calculated as a function of tem... Time dependent nucleation theory was applied to calculate the incubation time required for α Al nucleation in rapid solidified (RS) Al Fe V Si Nd alloys. The nucleation rates were calculated as a function of temperature, and the critical cooling rates required for the formation of amorphous α Al at different neodymium concentrations were calculated too. The addition of neodymium increases the amorphizablity of α Al by increasing the incubation time and decreasing the nucleation rate and the critical cooling rate. The calculations are fitted to experimental results when liquidus temperatures are estimated from an approximation, which treats Al Fe V Si Nd as quasi binary Al Fe system. 展开更多
关键词 rare earths NEODYMIUM amorphizablity Al Fe V Si Nd alloys time dependent nucleation theory rapid solidified processi?
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Dumb-bell Structures of Nonstoichiometric La(Ni, Sn)_(5+x) Alloys and Their Relationships with the Preparation Methods
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作者 YUANZhi-Qing LUGuang-Lie +1 位作者 WEIFan-Song LEIYong-Quan 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2004年第5期520-524,共5页
Crystal structures of nonstoichiometric La(Ni, Sn)5+x (x = 0.1~0.4) alloys prepared by different methods were investigated by using powder X-ray diffraction and Rietveld refinement analysis. Space group of this type ... Crystal structures of nonstoichiometric La(Ni, Sn)5+x (x = 0.1~0.4) alloys prepared by different methods were investigated by using powder X-ray diffraction and Rietveld refinement analysis. Space group of this type of alloys belongs to P6/mmm, in which Sn only occupies the 3g sites. It has been demonstrated that some of the 1a sites of the nonstoichiometric alloy are replaced by the NiNi dumb-bells which have a strong correlation with the anisotropic thermal parameter B33. The preparation methods have an effect on the number of dumb-bells that can substitute the 1a sites. It was found that the annealed alloys have more NiNi dumb-bells in the structure than the rapid solidified and as-cast alloys have while still keep good crystallinity. 展开更多
关键词 nonstoichiometric alloy rapid solidified alloy crystallographic structure Rietveld refinement
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