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Wear Properties of Ni_(3)Al-Ni_(3)V-Zr-Ni_(5)Zr Alloys under Different Atmospheres
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作者 WU Shang-a-meng WANG Zhensheng 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2024年第5期484-494,共11页
The study examines the friction and wear properties of Ni_(3)Al-Ni_(3)V-Zr-Ni_(5)Zr alloys under varying gas conditions.The alloy was tested in the presence of oxygen and carbon dioxide using a controlled atmosphere w... The study examines the friction and wear properties of Ni_(3)Al-Ni_(3)V-Zr-Ni_(5)Zr alloys under varying gas conditions.The alloy was tested in the presence of oxygen and carbon dioxide using a controlled atmosphere wear tester.The study revealed that the wear environ‐mental embrittlement resulted from the diffusion of reactive atomic hydrogen into the interior of the Ni_(3)Al-Ni_(3)V alloy.The addition of Zr elements decreased the proportion of Al elements on the surface of the Ni_(3)Al-Ni_(3)V-Zr-Ni_(5)Zr alloy and reduced the proportion of H atoms produced by the chemical reaction between atmospheric water vapour and Al elements.This inhibited the environmental embrittlement and improved the performance of the Ni_(3)Al-Ni_(3)V-Zr-Ni_(5)Zr alloy.The wear performance of Ni_(5)Zr alloy is superior to that of Ni_(3)Al-Ni_(3)V.When exposed to air in an air environment,the surface of Ni_(3)Al-Ni_(3)V-Zr-Ni_(5)Zr alloy forms a protective Al_(2)O_(3) oxide film on the workpiece,result‐ing in a reduction of the friction coefficient and wear rate of the alloy.The wear mechanism of the alloy is mainly oxidation wear and abra‐sive wear.In an oxygen environment,the surface of the alloy generates a significant amount of Al_(2)O_(3) oxide film.The flaking of the oxide film leads to an increase in the friction coefficient and wear rate of the alloy.In a carbon dioxide environment,the surface of the alloy un‐dergoes severe deformation,and plough lines become apparent.This is accompanied by flaking Si_(3)N_(4) abrasive chips adhering to the sur‐face of the alloy,which intensifies the wear of the alloy.The primary wear mechanism is abrasive wear.Therefore,the friction coefficient and wear rate of the Ni_(3)Al-Ni_(3)V-Zr-Ni_(5)Zr alloy in the atmosphere are optimal. 展开更多
关键词 metallic materials ni_(3)al-ni_(3)v-Zr-ni_(5)Zr alloys environmental embrittlement nickel-based alloys frictional wear
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A HIGH PERFORMANCE DS CAST Ni_3Al BASE ALLOY FOR ADVANCED GAS TURBINE BLADES AND VANES 被引量:8
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作者 HAN Yafang (Institute of Aeronautical Materials, Beijing, 100095, China)CHATURVEDIMC(University of Manitoba Winnipeg, Manitoba, Canada, R3T2N2) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1995年第Z1期497-502,共6页
A high performance Ni-Al-Mo-B system cast Ni_3Al base alloy, named Alloy IC6, has been developed for advanced gas turbine blades and vanes. The alloy has high strength and ductility from room temperature to 1100℃ as... A high performance Ni-Al-Mo-B system cast Ni_3Al base alloy, named Alloy IC6, has been developed for advanced gas turbine blades and vanes. The alloy has high strength and ductility from room temperature to 1100℃ as well as excellent creep resistance over a wide temperature range of 760℃ to 1100℃ . The superior mechanical properties of this alloy.may be attributed to (1) solid solution hardening by the large amount of Mo addition , (2)second phase strengthening by γ-phase and other minor phases that precipitate in various temperature ranges, (3) rearrangement of γ-phase in the form of raft structure during creep deformation , (4) high-density misfit dislocation networks at the γ /γ' interfaces that form due to a high value ofγ /γ ' misfit . 展开更多
关键词 ni_3Al alloy microstructure mechnical properties
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Ta和Re对Ni/Ni_(3)Al相界面断裂强度和蠕变强度的影响
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作者 胡雪兰 孙小清 +1 位作者 王梦媛 王亚如 《物理学报》 SCIE EI CAS CSCD 北大核心 2023年第6期72-80,共9页
采用基于密度泛函理论和广义梯度近似的第一原理方法,探究Ta元素和Re元素在Ni/Ni_(3)Al相界面中的相互作用及其对界面强度的影响.计算表明:在绝大多数化学计量比范围内, Ta原子优先占据γ相中的顶点Ni位, Re原子优先占据γ'相中的Al... 采用基于密度泛函理论和广义梯度近似的第一原理方法,探究Ta元素和Re元素在Ni/Ni_(3)Al相界面中的相互作用及其对界面强度的影响.计算表明:在绝大多数化学计量比范围内, Ta原子优先占据γ相中的顶点Ni位, Re原子优先占据γ'相中的Al位, Re原子和Ta原子共合金化时掺杂位置不发生改变.通过格里菲斯断裂功、不稳定堆垛层错能及空位迁移能的计算,得出Ta和Re合金化都可以增强界面的格里菲斯断裂能,提高界面的结合强度,两种合金化元素均提高了体系的不稳定堆垛层错能,即提高了界面阻碍位错运动的能力和抵抗变形的能力,其中Re的单独合金化效果更好.两种元素的掺杂提高了界面上空位迁移的势垒,阻碍了空位的发射和吸收,进而提高了合金的蠕变能力. 展开更多
关键词 第一性原理计算 ni/ni_(3)Al相界面 合金化元素Ta和Re 界面强度
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Ni_(3)Al-Ni_(3)V合金和Ni_(3)Al-Ni_(3)V(Zr)合金的微观组织与磨损特性
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作者 王振生 李海星 +2 位作者 易轶杰 谢威 宋力 《材料热处理学报》 CAS CSCD 北大核心 2022年第5期79-87,共9页
利用扫描电镜(SEM)、X射线衍射(XRD)、透射电镜(TEM)、磨损实验和力学和能量学计算等研究了Ni_(3)Al-Ni_(3)V合金和Ni_(3)Al-Ni_(3)V(Zr)合金的微观组织和磨损机理。结果表明:Ni_(3)Al-Ni_(3)V合金的组织主要由Ni_(3)Al相和Ni_(3)Al+Ni_... 利用扫描电镜(SEM)、X射线衍射(XRD)、透射电镜(TEM)、磨损实验和力学和能量学计算等研究了Ni_(3)Al-Ni_(3)V合金和Ni_(3)Al-Ni_(3)V(Zr)合金的微观组织和磨损机理。结果表明:Ni_(3)Al-Ni_(3)V合金的组织主要由Ni_(3)Al相和Ni_(3)Al+Ni_(3)V相构成,裂纹在合金磨损表面萌生,扩展方向与表面约呈18°;力学计算表明,Ni_(3)Al-Ni_(3)V合金的摩擦接触表面呈塑性接触状态,裂纹应力强度因子小于合金断裂韧性,接触应力不会导致裂纹产生;能量学计算表明,空气中的水汽与Ni_(3)Al-Ni_(3)V合金中的Ni_(3)Al相反应生成H,导致合金发生磨损环境致脆。Ni_(3)Al-Ni_(3)V(Zr)合金的组织主要由Ni_(3)Al相、Ni_(3)Al+Ni_(3)V相以及晶界处的富Zr相和Ni_(3)Zr相构成,Zr固溶在Ni_(3)Al相和Ni_(3)Al+Ni_(3)V相中;Zr抑制了Ni_(3)Al-Ni_(3)V(Zr)合金的环境脆性,合金的磨损机制为磨粒磨损和黏着磨损,磨损性能优于Ni_(3)Al-Ni_(3)V合金;Ni_(3)Al-Ni_(3)V(Zr)合金经不同工艺热处理后,可以得到具有纳米或微米尺度的Ni_(3)Al相,其中,具有纳米尺度的Ni_(3)Al相的合金的硬度高,磨损性能良好。 展开更多
关键词 ni_(3)al-ni_(3)v合金 ni_(3)al-ni_(3)v(Zr)合金 磨粒磨损 环境致脆 黏着磨损
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载体形貌对Ni_(3)Fe/CeO_(2)催化剂甲烷干重整反应性能的影响
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作者 张静文 李宇斌 +4 位作者 王倩倩 李莎 邱丽 李瑞丰 闫晓亮 《燃料化学学报(中英文)》 EI CAS CSCD 北大核心 2023年第12期1772-1781,共10页
通过改变水热法条件合成了不同形貌CeO_(2)载体(棒状CeO_(2)-R、立方体CeO_(2)-C和多面体CeO_(2)-P),并用浸渍法制备了Ni_(3)Fe/CeO_(2)催化剂,继而研究了不同载体形貌Ni_(3)Fe/CeO_(2)催化剂对其甲烷干重整反应性能的影响。采用X射线... 通过改变水热法条件合成了不同形貌CeO_(2)载体(棒状CeO_(2)-R、立方体CeO_(2)-C和多面体CeO_(2)-P),并用浸渍法制备了Ni_(3)Fe/CeO_(2)催化剂,继而研究了不同载体形貌Ni_(3)Fe/CeO_(2)催化剂对其甲烷干重整反应性能的影响。采用X射线衍射、N_(2)吸附-脱附、透射电镜、拉曼光谱、X射线光电子能谱、热重等对反应前后催化剂结构进行表征。结果表明,Ni_(3)Fe/CeO_(2)-R具有较大比表面积和较高的氧空位浓度,在甲烷干重整反应中表现出了优异的催化反应活性。800℃时,CH4和CO_(2)的转化率分别为82%和91%,且反应10 h性能稳定并且其积炭石墨化程度较低。同时,通过CeO_(2)-R载体氧空位对CO_(2)活化,有效抑制了对亲氧性Fe物种的过度氧化行为,反应前后催化剂Ni_(3)Fe合金结构保持稳定,具有良好的抗脱合金能力。 展开更多
关键词 甲烷干重整 形貌 ni_(3)Fe/CeO_(2) 氧空位 合金
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Comparative study on the hydrogen storage performance of as-milled MgRENi rapid quenched alloy catalyzed by metal sulfides
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作者 Xiaoping Dong Zhaoqing Zhang +3 位作者 Liying Yang Shenghai Xin Dandan Su Zhiyuan Li 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第5期2010-2023,共14页
The composites of Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)as-quenched alloy and 3 wt.%M(M=CoS,CoS_(2),MoS_(2))catalyst were prepared by high-speed vibration ball mill.The effects of metal sulfides on the hydrogenation and dehy... The composites of Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)as-quenched alloy and 3 wt.%M(M=CoS,CoS_(2),MoS_(2))catalyst were prepared by high-speed vibration ball mill.The effects of metal sulfides on the hydrogenation and dehydrogenation dynamics of alloys were compared.The results show that the as-milled composites contain a large number of amorphous embedded by a small amount of nanocrystals,and there are many point defects.After ball milling,the crystal grain size in the composites containing CoS is relatively larger,followed by CoS_(2)and MoS_(2)again.After hydrogenation,the amorphous phase is crystallized to form Mg_(2)NiH_(4),YH_(3),Pr_(8)H_(18.96),Sm_(3)H_7,Mg,Co or Mo phases,however,Mg_(2)Ni,YH_(2),PrH_(2)and Ni_(3)Y phases appeared after dehydrogenation.The maximum hydrogenation capacity of the composites containing CoS,CoS_(2)and MoS_(2)are 3.939,4.265 and 4.507 wt.%,respectively.The hydrogenation saturation ratio of composite containing MoS_(2)is higher than that of the composites containing CoS and CoS_(2).The dehydrogenation activation energy of the composites containing CoS,CoS_(2)and MoS_(2)is 107.76,68.43 and 63.28 kJ.mol^(-1).H_(2).On the improvement of hydrogen storage performance of Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)alloy,the catalytic effect of MoS_(2)sulfide is better than that of CoS_(2)sulfide,and which is better than CoS sulfide. 展开更多
关键词 Mg_(20)Pr_(1)Sm_(3)Y_(1)ni_(10)as-quenched alloy COS CoS_(2)and MoS_(2)sulfide MILLING Activation energy Hydrogen storage dynamics
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C,Fe,Si掺杂Al_(3)V合金的电子结构与力学性能 被引量:2
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作者 唐树伟 吴孟修 +2 位作者 罗东明 王鑫林 白树林 《中国有色金属学报》 EI CAS CSCD 北大核心 2023年第1期138-148,共11页
采用第一性原理计算方法研究了铝钒合金Al_(3)V及其C、Fe、Si取代掺杂的Al_(24)V_(7)X、Al_(23)V_(8)X (X=C,Fe,Si)合金晶体结构的稳定性、电子结构和力学性能。计算结果表明,X (X=C,Fe,Si)掺杂对Al_(3)V合金晶体结构的影响较小,Al_(24)... 采用第一性原理计算方法研究了铝钒合金Al_(3)V及其C、Fe、Si取代掺杂的Al_(24)V_(7)X、Al_(23)V_(8)X (X=C,Fe,Si)合金晶体结构的稳定性、电子结构和力学性能。计算结果表明,X (X=C,Fe,Si)掺杂对Al_(3)V合金晶体结构的影响较小,Al_(24)V_(7)X和Al_(23)V_(8)X (X=C,Fe,Si)仍然保持明显的Al_(3)V金属特征。Mulliken电荷布居和重叠布居分析显示X (X=C,Fe,Si)会与周围Al和V原子产生键合作用,提高Al_(24)V_(7)X和Al_(23)V_(8)X (X=C,Fe,Si)的稳定性和抗变形能力。X (X=C,Fe,Si)的取代掺杂对Al_(3)V合金晶体的刚度影响较小,但能使Al_(3)V合金材料的塑性有所提升,有望能有效解决Al_(3)V合金的脆性问题,拓宽Al_(3)V合金的应用范围。 展开更多
关键词 Al_(3)v合金 第一性原理计算 力学性能 电子结构 元素掺杂
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一种新型Ni_(3)Al基高温耐磨合金的显微组织和性能研究
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作者 侯杰 李尚平 骆合力 《铸造》 CAS 北大核心 2023年第9期1105-1108,共4页
针对我国新一代航空发动机叶冠表面强化用高温耐磨材料的迫切需求,采用熔炼铸造法制备出一种以碳化铬和NiAl相作为耐磨硬质相的新型Ni_(3)Al基高温耐磨合金。显微组织分析、室温硬度测试、高温抗氧化性测试结果显示,两种耐磨硬质相大量... 针对我国新一代航空发动机叶冠表面强化用高温耐磨材料的迫切需求,采用熔炼铸造法制备出一种以碳化铬和NiAl相作为耐磨硬质相的新型Ni_(3)Al基高温耐磨合金。显微组织分析、室温硬度测试、高温抗氧化性测试结果显示,两种耐磨硬质相大量析出并且均匀分布于合金中。与现役的高温耐磨材料相比,该合金同时具备高的室温硬度和1050℃时优异的抗氧化性,有望成为新一代高温耐磨材料。 展开更多
关键词 ni_(3)Al 高温耐磨合金 显微组织 硬度 抗氧化
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Microstructure and Mechanical Properties of Recycled Ni_3Al Base Alloy IC6 被引量:3
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作者 宋尽霞 肖清云 +3 位作者 臧川 肖程波 李树索 韩雅芳 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2002年第1期55-60,共6页
The effect of recycle proportion on the composition,microstructure and mechanical prop- erites of recycled Ni_3Al basealloy IC6 was examined by scanning electron microscopy with X-ray en-ergy-dispersive spectrometer (... The effect of recycle proportion on the composition,microstructure and mechanical prop- erites of recycled Ni_3Al basealloy IC6 was examined by scanning electron microscopy with X-ray en-ergy-dispersive spectrometer (SEM/ES) and transmission electronmicroscopy (TEM). The results indicate that the addition of recycledscraps has no obvious effect on the chemical composition, except thecontent of C and N increases with the addition proportion of recycledscraps. The microstructure of IC6 recycled alloys has no obviousdifference compared with the fresh alloy, except some M_6C car- bidesprecipitate in the interdendritic area. 展开更多
关键词 ni_3Al recyclced alloy MICROSTRUCTURE mechanical properties
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HAZ CRACKING AND HOT DUCTILITY OF Ni_3AI CONTAINING Zr ALLOY 被引量:3
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作者 B. N. Qian J. L. Li J. T. Guo and B. Z. Wei (1)Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015, China 2)Shanghai University, Shanghai 200072, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第1期94-97,共4页
The HAZ cracking test in EB welding condition and hot ductility test show that the cracking mechanism is the formation of Ni - Ni5Zr eutectic which is resulting from the enrichment of Zr in grain boundaries during ... The HAZ cracking test in EB welding condition and hot ductility test show that the cracking mechanism is the formation of Ni - Ni5Zr eutectic which is resulting from the enrichment of Zr in grain boundaries during welding.In order to eliminate HAZ cracks the diffusion and recrystalization anealing treatment after cast and during cold rolling should be conducted in vacuum or protecting atmosphere and at the same time a slow welding speed is necessary. 展开更多
关键词 ni_3Al bearing Zr alloy liquation cracking hot ductility test
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Correlation of the Mechanical Properties of Polycrystalline Ni_3Al Alloys with Their Electronic Structure 被引量:1
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作者 Wen DENG Liangyue XIONG Chiwei LUNG International Centre for Materials Physics,Institute of Metal Research,Academia Sinica,Shenyang,110015,ChinaShuhe WANG Jianting GUO Institute of Metal Research,Academia Sinica,Shenyang,110015,China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1993年第3期226-228,共3页
The electronic structure of Ni_3Al alloys with different B contents has been investigated by measuring the positron lifetime spectra.The segregation of B atoms to defects could form strong covalent bondings with Ni an... The electronic structure of Ni_3Al alloys with different B contents has been investigated by measuring the positron lifetime spectra.The segregation of B atoms to defects could form strong covalent bondings with Ni and Al atoms and make the electronic structure in those locations similar to that in bulk,thus strengthen their cohesion.The interaction of B atoms,which were solid-solutioned in the crystal lattice of Ni_3Al in a manner of occupying interstitial sites,with Ni and Al atoms resulted in the increase of the density of valent electrons,thus increased the bonding cohesion in bulk.The im- provement of the mechanical properties of Ni_3Al alloys by B doping was due to both“grain bounda- ry effect”and“bulk effect”of B,which correlated with their electronic structure. 展开更多
关键词 electronic structure B addition mechanical properties ni_3Al alloy
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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni_3Al-Fe BASED ALLOY 被引量:1
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作者 LI Hui GUO Jianting TAN Minghui SUN Chao LAI Wanhui WANG Shuhe Institute of Metal Research,Academia Sinica,Shenyang,China Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1993年第1期40-45,共6页
The microstructure,tensile properties at 20—950℃ and creep rupture properties at 700- 900℃ in a Ni_3Al-Fe based alloy after high temperature deformation have been studied.The results show the microstructure of the ... The microstructure,tensile properties at 20—950℃ and creep rupture properties at 700- 900℃ in a Ni_3Al-Fe based alloy after high temperature deformation have been studied.The results show the microstructure of the alloy is composed of γ′-and β-phases.The grain size and yield strength of the alloy is stable when the temperature≤600℃,and it is ductile at high temperature.The creep of the alloy at 700—900℃ is controlled by the climbing of dislo- cations,and the activation energy for creep is 439 KJ/mol with a stress exponent of 4. 展开更多
关键词 ni_3Al-Fe based alloy MICROSTRUCTURE mechanical property creep rupture property
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DIFFUSION PHENOMENA AND MICROSTRUCTURE STABILITY OF Ni-Cr-Al-Y-Si COATING ON THENi_3Al BASED ALLOY SUBSTRATE 被引量:1
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作者 Z.P. Xing Y.F. Han Y.L. Ji and M.G. Yan(Beijing Institute of Aeronautical Materials, Beijing 100095, ) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第6期635-639,共5页
In this paper, Ni-Cr-Al-Y-Si coating deposited by vacuum are deposition on the Ni_3Alalloy IC6, the typical use of which is for turbine blades and vanes, was examined.The results of the tests show that the tensile pro... In this paper, Ni-Cr-Al-Y-Si coating deposited by vacuum are deposition on the Ni_3Alalloy IC6, the typical use of which is for turbine blades and vanes, was examined.The results of the tests show that the tensile properties at room temperature and stress rupture properties at 1100℃ of the IC6 alloy were not obviously influenced by the coatings. At annealing state, limited element interdiffusion was observed. After stress rupture testing for 252 h at 1100℃/90 MPa, however,significant interdiffusion of Mo, Cr and Al took place between the coating layer and the substrate.The element diffustion did not result in the formation of brittle phases on the coating/substrate interface. No cracking and spallation in the coating were found.Therefore it can be concluded that the Ni-Cr-Al-Y-Si overlay coating was successful for protecting the IC6 alloy. 展开更多
关键词 M-Cr-Al-Y coating ni_3Al based alloy microstructure stability vskip 0.6cm
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Effect of hot deformation on α→β phase transformation in 47Zr-45Ti-5Al-3V alloy 被引量:1
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作者 Yuan-biao TAN Li-yuan Ji +3 位作者 Wen-chang LIU Song XIANG Fei ZHAO Yi-long LIANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第10期1947-1957,共11页
The effect of strain rate and deformation temperature on theα→βphase transformation in 47Zr-45Ti-5Al-3V alloy with an initial widmanstattenαstructure was investigated.At the deformation temperature of 550°C,t... The effect of strain rate and deformation temperature on theα→βphase transformation in 47Zr-45Ti-5Al-3V alloy with an initial widmanstattenαstructure was investigated.At the deformation temperature of 550°C,the volume fraction ofαphase decreased with increasing strain rate.At 600 and 650°C,the volume fraction ofαphase firstly increased to a maximum value with increasing strain rate from 1×10-3 to 1×10-2 s-1,and then decreased.At 700°C,the microstructure consisted of singleβphase.At a given strain rate,the volume fraction ofαphase decreased with increasing deformation temperature.With decreasing strain rate and increasing deformation temperature,the volume fraction and size of globularαphase increased.At 650°C and 1×10-3 s-1,the lamellarαphase was fully globularized.The variation in the volume fraction and morphology ofαphase with strain rate and deformation temperature significantly affected the hardness of 47Zr-45Ti-5Al-3V alloy. 展开更多
关键词 47Zr-45Ti-5Al-3v alloy hot deformation phase transformation vickers hardness microstructure
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CERIUM-INDUCED GRAIN BOUNDARY STRENGTHENINGOF Ni_3Al ALLOYS
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作者 Z.X. Yuan S.H. Song +1 位作者 T.H. X.i X.J. Zhangand Z.S. Yu(Department of Material, Wuhan Ye in University of Science and Technology, Wuhan 430081, China)(Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1997年第4期349-357,共9页
The infiuence of cerium on grnin boundaries of polycrpstalline N3Al alloys has beenstudied. The ja6mcability of a Ce-doped N3Al alloy strongly depends on the certumcontent. The alloy exhibits very poor fabrica6ility a... The infiuence of cerium on grnin boundaries of polycrpstalline N3Al alloys has beenstudied. The ja6mcability of a Ce-doped N3Al alloy strongly depends on the certumcontent. The alloy exhibits very poor fabrica6ility and cannot be fabrtcated into goodsheet8 by cold rolling when the concentmtion of cerium is <0. 0088wt% or>0.044wt%.A 0.011wt%Ce-doped N3Al alloy exhibits relatively good fabricability and may be fab-ricated into useful sheets by repeated cold rolling with 1OOa C annealing. The ductilityof the alloy strongly depends on the cerium distribution. Wthout the grain boundaryprecipitation of a second phase containing cer1um) the higher the segmpation level ofcerzum, the 6ettcr the tensile properties of the alloys, and in turn the more enhancedthe grain boundary cohesion. 展开更多
关键词 segregation ni_3Al alloy DUCTILITY fabrication CERIUM
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A Zr-RICH LOW MELTING POINT PHASE IN Ni_3Al ALLOY WITH Zr
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作者 ZHANG Jishan TANG Yajun ZHANG Jinghua ZHANG Zhiya YU Yang LI Ying ao HU Zhuangqi Institute of Metal Research,Academia Sinica,Shenyang,China ZHANG Jishan Institute of Metal Research,Academia Sinica,Shenyang 110015,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1990年第2期149-151,共3页
A Zr-rich phase,Ni_5Zr,with low melting point has been fouhd in an Ni_3Al alloy doped with Zr(1.2at.-%).It will cause the incipient melt of the alloy after being homogenized at 1300℃. This makes it difficult to homog... A Zr-rich phase,Ni_5Zr,with low melting point has been fouhd in an Ni_3Al alloy doped with Zr(1.2at.-%).It will cause the incipient melt of the alloy after being homogenized at 1300℃. This makes it difficult to homogenize the coarse casting structures completely and limits the further improvement of properties of the Ni_3Al alloy. 展开更多
关键词 ni_3Al monocrystalline alloy ni_5Zr phase HOMOGEniZATION
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Al_2O_3颗粒强化Ni_3Al合金的机械合金化合成及烧结 被引量:7
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作者 张志俊 王艳文 +1 位作者 刘鹤 金松哲 《长春工业大学学报》 CAS 2005年第2期154-157,共4页
利用机械合金化方法合成了Ni3Al金属间化合物和Al2O3混合粉末,并用放电等离子烧结技术,将Ni3Al/Al2O3混合粉末烧结成块状烧结体。研究了烧结体的显微组织和力学性能。X射线检测表明:Ni粉和Al粉在高能球磨机中球磨5h,即可转变为Ni3Al金... 利用机械合金化方法合成了Ni3Al金属间化合物和Al2O3混合粉末,并用放电等离子烧结技术,将Ni3Al/Al2O3混合粉末烧结成块状烧结体。研究了烧结体的显微组织和力学性能。X射线检测表明:Ni粉和Al粉在高能球磨机中球磨5h,即可转变为Ni3Al金属间化合物。采用放电等离子烧结技术在1000℃保温3min,就可以烧结成相对密度约为99%的较致密的复合材料烧结体。 展开更多
关键词 复合材料 ni3AL AL2O3 机械合金化 放电等离子烧结
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Mn在γ′-Ni_(3)Al中的择优占位
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作者 黄仁忠 刘丽丽 +1 位作者 魏媛媛 刘雅娟 《沈阳师范大学学报(自然科学版)》 CAS 2021年第6期500-505,共6页
用3种方法探究Mn在γ′-Ni_(3)Al中的择优占位情况。位置优先能的计算结果显示Mn在Ni_(3)Al中有强烈占据Ni亚晶格的倾向。转移能的计算结果显示Mn仍然占据Ni亚晶格,但是占据倾向较弱。第一性原理结合Wagner-Schottky模型的计算结果表明,... 用3种方法探究Mn在γ′-Ni_(3)Al中的择优占位情况。位置优先能的计算结果显示Mn在Ni_(3)Al中有强烈占据Ni亚晶格的倾向。转移能的计算结果显示Mn仍然占据Ni亚晶格,但是占据倾向较弱。第一性原理结合Wagner-Schottky模型的计算结果表明,0 K时,Mn在Ni_(3)Al中无明显占据倾向,随着温度的升高,在富Al的Ni_(3)Al合金中,Mn由占据Ni亚晶格转为占据Al亚晶格;在正常化学计量比的合金中,Mn由无明显占据倾向转变为占据Al亚晶格;在富Ni的合金中,Mn一直占据Al亚晶格。显然利用Wagner-Schottky模型可得到与实验结果相符的结论,同时可考察掺杂原子在γ′-Ni_(3)Al中的占位随合金成分及温度的变化。 展开更多
关键词 ni_(3)Al合金 第一性原理 形成焓 Wagner-Schottky模型
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非晶合金Fe_(3)Ni_(3)的轨道杂化及成键性质研究
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作者 郑新喜 方志刚 +2 位作者 曾鑫渔 侯欠欠 刘立娥 《天然气化工—C1化学与化工》 CAS 北大核心 2022年第6期91-96,共6页
为探究团簇Fe_(3)Ni_(3)优化构型内的轨道杂化及成键情况,在密度泛函理论中的B3LYP/Lanl2dz水平下,利用Gaussian软件对构型进行全参数优化计算后,得到9种稳定的优化构型,发现三重态构型均较单重态构型稳定。进一步分析各优化构型的态密... 为探究团簇Fe_(3)Ni_(3)优化构型内的轨道杂化及成键情况,在密度泛函理论中的B3LYP/Lanl2dz水平下,利用Gaussian软件对构型进行全参数优化计算后,得到9种稳定的优化构型,发现三重态构型均较单重态构型稳定。进一步分析各优化构型的态密度发现,团簇Fe_(3)Ni_(3)各优化构型内部主要存在4s-4s、4p-4p、4p-3d与3d-3d 4种轨道杂化方式,其中4s-4s轨道杂化贡献最弱,3d-3d轨道杂化的贡献最强。从键长、键级与键级贡献比3个角度探究成键性质发现,Fe—Fe键与Fe—Ni键的存在对构型稳定性均具有促进作用,其中三重态中Fe—Ni键起主要贡献作用,而单重态中Fe—Fe键贡献作用最大,说明自旋多重度对构型内成键具有选择性,进而影响其稳定性。 展开更多
关键词 非晶合金Fe_(3)ni_(3) 密度泛函理论 态密度 轨道杂化 成键
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σ相对有序态(Fe,Ni)_3V-B合金力学性能的作用
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作者 唐莒平 陈业新 《上海金属》 CAS 北大核心 2016年第1期29-33,共5页
研究了室温下σ相对不同硼含量有序态(Fe,Ni)_3V-B合金在真空中力学性能的作用,研究结果表明:随着合金中硼含量的增加,有序态(Fe,Ni)_3V-B合金的晶粒尺寸变小;合金中σ相的含量随之增加;有序态(Fe,Ni)_3V-B合金的延伸率基本保持恒定,而... 研究了室温下σ相对不同硼含量有序态(Fe,Ni)_3V-B合金在真空中力学性能的作用,研究结果表明:随着合金中硼含量的增加,有序态(Fe,Ni)_3V-B合金的晶粒尺寸变小;合金中σ相的含量随之增加;有序态(Fe,Ni)_3V-B合金的延伸率基本保持恒定,而合金的抗拉强度却呈增加的趋势。含σ相有序态(Fe,Ni)_3V-B合金在真空中的力学性能受合金中的硼含量、σ相的含量及其分布的共同影响。 展开更多
关键词 σ相(Fe ni)3v—B合金力学性能硼含量
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