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Improving ductility by coherent nanoprecipitates in medium entropy alloy

文献类型：期刊论文

作者Zhang ZH(张子晗)2,3; Ma Y(马彦)1,3; Yang MX(杨沐鑫)3; Jiang P(姜萍)3; Feng HQ(冯航旗)3; Zhu, Yuntian1; Wu XL(武晓雷)2,3; Yuan FP(袁福平)2,3
刊名INTERNATIONAL JOURNAL OF PLASTICITY
出版日期2024
卷号172页码:13
ISSN号0749-6419
关键词Medium-entropy alloys Ductility Coherent nanoprecipitates 9R structures Precipitation hardening
DOI10.1016/j.ijplas.2023.103821
通讯作者Ma, Yan(mayan@imech.ac.cn) ; Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
英文摘要Controlling precipitates in spatial density and size distribution is essential for tailoring the microstructure and mechanical properties through precipitation hardening. We herein obtained heterogeneous grain structures with coherent L12 nanoprecipitates in (CrCoNi)94Al4Ti2 medium entropy alloy (MEA) by annealing and aging. Additional pre-aging leads to a high spatial density and more random distribution nucleation sites of the coherent L12 nanoprecipitates. The preaging doubled the ductility without apparently sacrificing the strength. Transmission electron microscopy (TEM) revealed that, in pre-aged MEA, finely dispersed L12 nanoprecipitates with higher spatial density were sheared by dislocation, promoting planar slips, which favors geometrically necessary dislocations (GNDs) piling up to increased hetero-deformation-induced (HDI) stress and work-hardening. Stacking faults, Lomer-Cottrell locks, and 9R structures were formed in aged and pre-aged MEA after tensile deformation. The formation of these defects enormously enhanced strain hardening by blocking dislocation movements and accumulating dislocations. Moreover, a higher frequency of interactions between defects and coherent L12 nanoprecipitates can be observed in the pre-aged MEA due to the more randomly distributed L12 nanoprecipitates, substantially increasing ductility. This work demonstrates a new route to achieving a super strength-ductility combination of single-phase FCC high entropy alloys by nanoscale coherent precipitation strengthening.
分类号一类
WOS关键词LOCAL LATTICE DISTORTION ; SHORT-RANGE ORDER ; MEDIATED FORMATION ; HIGH-STRENGTH ; MECHANISMS ; PRECIPITATION ; NANOPARTICLES ; DEFORMATION
资助项目National Natural Science Foundation of China (NSFC) Basic Science Center Program[11988102] ; National Key Research & Development Program of China[2017YFA0204402] ; National Natural Science Foundation of China[52192591] ; National Natural Science Foundation of China[11790293] ; Hong Kong Research Grants Council[GRF 11214121] ; Hong Kong Institute for Advanced Study
WOS研究方向Engineering ; Materials Science ; Mechanics
语种英语
WOS记录号WOS:001135202500001
资助机构National Natural Science Foundation of China (NSFC) Basic Science Center Program ; National Key Research & Development Program of China ; National Natural Science Foundation of China ; Hong Kong Research Grants Council ; Hong Kong Institute for Advanced Study
其他责任者Ma, Yan ; Yuan, Fuping
源URL[http://dspace.imech.ac.cn/handle/311007/94024]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Zhang ZH,Ma Y,Yang MX,et al. Improving ductility by coherent nanoprecipitates in medium entropy alloy[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2024,172:13.
APA 张子晗.,马彦.,杨沐鑫.,姜萍.,冯航旗.,...&袁福平.(2024).Improving ductility by coherent nanoprecipitates in medium entropy alloy.INTERNATIONAL JOURNAL OF PLASTICITY,172,13.
MLA 张子晗,et al."Improving ductility by coherent nanoprecipitates in medium entropy alloy".INTERNATIONAL JOURNAL OF PLASTICITY 172(2024):13.

入库方式： OAI收割

来源：力学研究所

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