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

doi:10.1016/j.jmst.2021.03.028

IMECH-IR > 微重力重点实验室

	Phase transition and heterogeneous strengthening mechanism in CoCrFeNiMn high-entropy alloy fabricated by laser-engineered net shaping via annealing at intermediate-temperature
	Bai YJ(白云建)1,3 ; Jiang H(姜恒)1,3 ; Yan, Kuo 1; Li, Maohui 5; Wei YP(魏延鹏)2,3 ; Zhang K(张坤)1,3 ; Wei BC(魏炳忱)1,3,4
通讯作者	Zhang, Kun(zhangkun@imech.ac.cn) ; Wei, Bingchen(weibc@imech.ac.cn)
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2021-11-30
卷号	92 页码:129-137
ISSN	1005-0302
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.
关键词	High-entropy alloys Phase transition Heterogeneous strengthening Intermediate-temperature
DOI	10.1016/j.jmst.2021.03.028
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000718812700003
关键词[WOS]	STAINLESS-STEEL ; TENSILE PROPERTIES ; ENHANCED STRENGTH ; RESIDUAL-STRESS ; MICROSTRUCTURE ; DEFORMATION ; PARAMETERS ; COMPOSITES ; EVOLUTION ; DUCTILITY
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
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]
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program
论文分区	一类
力学所作者排名	1
RpAuthor	Zhang, Kun ; Wei, Bingchen
引用统计	被引频次：23[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/88012
专题	微重力重点实验室流固耦合系统力学重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China; 2.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 4.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China; 5.Acad Mil Med Sci, Acad Syst Engn, Inst Quartermaster Engn & Technol, Beijing 100010, Peoples R China
推荐引用方式 GB/T 7714	Bai YJ,Jiang H,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	白云建.,姜恒.,Yan, Kuo.,Li, Maohui.,魏延鹏.,...&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	白云建,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.

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