| 合金化韧化MoSi_2的研究 |
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| 引用本文： | 张来启,杜伟,林均品,陈国良. 合金化韧化MoSi_2的研究[J]. 金属世界, 2009, 0(Z1) |
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| 作者姓名： | 张来启 杜伟 林均品 陈国良 |
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| 作者单位： | 北京科技大学新金属材料国家重点实验室,北京,100083 |
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| 基金项目： | 国家自然科学基金项目 |
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| 摘 要： | 本文用XRD、SEM-EDS、EPMA、维氏硬度仪及压痕法研究了Nb、Al、Cr合金化对MoSi2组织结构、室温硬度及断裂韧性的影响.结果表明:2at%Al、4at%Al和2at%Cr三种合金均得到了单一四方Cllb相;6at%Nb合金因Nb含量高,导致部分四方C11b相转变为六方C40相,合金出现灰色Cllb基体相与亮白色层片状C40第二相双相组织,部分C40相中存在几乎平行排列的宽度贯穿裂纹.Nb、Al、Cr合金化都降低MoSi2的维氏硬度,提高断裂韧性,其中2at%Nb、4at%Al合金的断裂韧性最高,达到了5.90MPa·m1/2,提高了69%.
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| 关 键 词： | 合金化 韧化 组织结构 硬度 断裂韧性 |
Investigation on Toughening MoSi_2 by Alloying |
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| Zhang Laiqi,Du Wei,Lin Junpin,Chen Guoliang. Investigation on Toughening MoSi_2 by Alloying[J]. Metal World, 2009, 0(Z1) |
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| Authors: | Zhang Laiqi Du Wei Lin Junpin Chen Guoliang |
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| Affiliation: | State Key Laboratory for Advanced Metals and Materials;University of Science and Technology Beijing;Beijing 100083 |
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| Abstract: | The effects of Nb,Al and Cr alloying on microstructure,hardness and fracture toughness at room temperature of MoSi_2 were investigated by means of XRD,SEM-EDS,EPMA,Vickers and indentation toughness method.The results show that all of the three alloys with 2at%Al,4at%Al and 2at%Cr have only tetragonal C11_b phase;while in the alloy with 6at%Nb, tetragonal C11_b phase has partly transformed to hexagonal C40 phase due to addition of excessive Nb.Thus the dual-phase microstructure with grey C11_b matrix and whi... |
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| Keywords: | MoSi2 |
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