| 镧对NbMoTiVSi0.2难熔高熵合金显微组织与力学性能的影响 |
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| 引用本文： | 徐琴,陈德志,王聪锐,曹文超,王琪,崔洪芝,张书彦,陈瑞润. 镧对NbMoTiVSi0.2难熔高熵合金显微组织与力学性能的影响[J]. 中国有色金属学会会刊, 2021, 31(2): 512-520. DOI: 10.1016/S1003-6326(21)65513-9 |
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| 作者姓名： | 徐琴 陈德志 王聪锐 曹文超 王琪 崔洪芝 张书彦 陈瑞润 |
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| 摘 要： | 为了研究La对难熔高熵合金显微组织与力学性能的影响,制备不同La含量的NbMoTiVSi0.2合金,并对其相组成、显微组织演变、压缩性能及相关机理进行系统分析.结果表明,不同La含量的合金由BCC固溶体、共晶组织、MSi2二硅化物和La析出相组成.共晶组织及大部分La析出相在晶界处形成,而二硅化物相在晶粒内部形成.La...
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| 关 键 词： | 高熵合金 镧 共晶组织 难熔金属 二硅化物 |
| 收稿时间： | 2020-03-29 |
Effects of La on microstructure and mechanical properties of NbMoTiVSi0.2 refractory high entropy alloys |
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| Qin XU,De-zhi CHEN,Cong-rui WANG,Wen-chao CAO,Qi WANG,Hong-zhi CUI,Shu-yan ZHANG,Rui-run CHEN. Effects of La on microstructure and mechanical properties of NbMoTiVSi0.2 refractory high entropy alloys[J]. Transactions of Nonferrous Metals Society of China, 2021, 31(2): 512-520. DOI: 10.1016/S1003-6326(21)65513-9 |
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| Authors: | Qin XU De-zhi CHEN Cong-rui WANG Wen-chao CAO Qi WANG Hong-zhi CUI Shu-yan ZHANG Rui-run CHEN |
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| Affiliation: | 1. School of Mechanic and Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China;2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China;3. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;4. Centre of Excellence for Advanced Materials, Dongguan 523808, China |
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| Abstract: | To study the effects of La on the microstructure and mechanical properties of refractory high entropy alloys, NbMoTiVSi0.2 alloys with different La contents were prepared. Phase constitution, microstructure evolution, compressive properties and related mechanisms were systematically studied. Results show that the alloys with La addition are composed of BCC solid solution, eutectic structure, MSi2 disilicide phase and La-containing precipitates. Eutectic structure and most of La precipitates are formed at the grain boundaries. Disilicide phase is formed in the grains. La can change the grain morphologies from dendritic structure to near-equiaxed structure, and the average grain size decreases from 180 to 20 μm with the increase of La content from 0 to 0.5 at.%. Compressive testing shows that the ultimate strength and the yield strength increase with the increase of La content, which is resulted from the grain boundary strengthening. However, they cannot be greatly improved because of the formation of MSi2 disilicide phase with low strength. The ductility decreases with the increase of La content, which is due to the La precipitates and brittle MSi2 disilicide phase. |
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| Keywords: | high entropy alloy lanthanum eutectic structure refractory metal disilicide phase |
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