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Phase transition and heterogeneous strengthening mechanism in CoCrFeNiMn high-entropy alloy fabricated by laser-engineered net shaping via annealing at intermediate-temperature

文献类型：期刊论文

作者Bai, Yunjian3,5; Jiang, Heng3,5; Yan, Kuo5; Li, Maohui1; Wei, Yanpeng3,4; Zhang, Kun3,5; Wei, Bingchen2,3,5; Wei YP(魏延鹏); Bai YJ(白云建); Jiang H(姜恒)
刊名JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
出版日期2021-11-30
卷号92页码:129-137
关键词High-entropy alloys Phase transition Heterogeneous strengthening Intermediate-temperature
ISSN号1005-0302
DOI10.1016/j.jmst.2021.03.028
通讯作者Zhang, Kun(zhangkun@imech.ac.cn) ; Wei, Bingchen(weibc@imech.ac.cn)
英文摘要High-entropy alloys (HEAs) have attracted tremendous attention owing to their controllable mechanical properties, whereas additive manufacturing (AM) is an efficient and flexible processing route for novel materials design. However, a profound appraisal of the fundamental material physics behind the strengthening of AM-printed HEAs upon low/intermediate-temperature annealing is essential. In this work, CoCrFeNiMn HEAs have been prepared using laser-engineered net shaping (LENS) and subsequently annealed at different temperatures. The CoCrFeNiMn HEA annealed at intermediate-temperature (873 K) exhibits a strong strain hardening capability, resulting in ultimate strength of 725 MPa and plasticity of 22%. A ternary heterogeneous strengthening mechanism is proposed to explain this phenomenon, in which equiaxed grains, columnar grains, and sigma precipitates play different roles during tensile deformation. The resultant excellent strength and ductility can be ascribed to the heterostructure-induced mismatch. The equiaxed grains provide adequate grain boundaries (GBs), which induce dislocation plugging-up and entanglement; the columnar grains induce the onset and arrest of the dislocations for plastic deformation; and the sigma precipitates hinder the movement of slip dislocations. The results provide new insights into overcoming the strength-ductility trade-off of LENS-printed HEAs with complex geometries. (C) 2021 Published by Elsevier Ltd on behalf of Chinese Society for Metals.
WOS关键词STAINLESS-STEEL ; TENSILE PROPERTIES ; ENHANCED STRENGTH ; RESIDUAL-STRESS ; MICROSTRUCTURE ; DEFORMATION ; PARAMETERS ; COMPOSITES ; EVOLUTION ; DUCTILITY
资助项目National Natural Science Foundation of China[51401028] ; National Natural Science Foundation of China[51271193] ; National Natural Science Foundation of China[11402277] ; National Natural Science Foundation of China[11790292] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040303] ; Innovation Program[237099000000170004]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000718812700003
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program
源URL[http://dspace.imech.ac.cn/handle/311007/88011]  
专题力学研究所_国家微重力实验室
力学研究所_流固耦合系统力学重点实验室(2012-)
通讯作者Zhang, Kun; Wei, Bingchen
作者单位1.Acad Mil Med Sci, Acad Syst Engn, Inst Quartermaster Engn & Technol, Beijing 100010, Peoples R China
2.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China
5.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Bai, Yunjian,Jiang, Heng,Yan, Kuo,et al. Phase transition and heterogeneous strengthening mechanism in CoCrFeNiMn high-entropy alloy fabricated by laser-engineered net shaping via annealing at intermediate-temperature[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,92:129-137.
APA Bai, Yunjian.,Jiang, Heng.,Yan, Kuo.,Li, Maohui.,Wei, Yanpeng.,...&魏炳忱.(2021).Phase transition and heterogeneous strengthening mechanism in CoCrFeNiMn high-entropy alloy fabricated by laser-engineered net shaping via annealing at intermediate-temperature.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,92,129-137.
MLA Bai, Yunjian,et al."Phase transition and heterogeneous strengthening mechanism in CoCrFeNiMn high-entropy alloy fabricated by laser-engineered net shaping via annealing at intermediate-temperature".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 92(2021):129-137.

入库方式： OAI收割

来源：力学研究所

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