Improving ductility by coherent nanoprecipitates in medium entropy alloy

doi:10.1016/j.ijplas.2023.103821

IMECH-IR > 非线性力学国家重点实验室

	Improving ductility by coherent nanoprecipitates in medium entropy alloy
	Zhang ZH(张子晗)1,2 ; Ma Y(马彦)1,3; Yang MX(杨沐鑫)1 ; Jiang P(姜萍)1 ; Feng HQ(冯航旗)1; Zhu, Yuntian 3; Wu XL(武晓雷)1,2 ; Yuan FP(袁福平)1,2
通讯作者	Ma, Yan(mayan@imech.ac.cn) ; Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
	2024
卷号	172 页码:13
ISSN	0749-6419
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.
关键词	Medium-entropy alloys Ductility Coherent nanoprecipitates 9R structures Precipitation hardening
DOI	10.1016/j.ijplas.2023.103821
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001135202500001
关键词[WOS]	LOCAL LATTICE DISTORTION ; SHORT-RANGE ORDER ; MEDIATED FORMATION ; HIGH-STRENGTH ; MECHANISMS ; PRECIPITATION ; NANOPARTICLES ; DEFORMATION
WOS研究方向	Engineering ; Materials Science ; Mechanics
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
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
项目资助者	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
论文分区	一类
力学所作者排名	1
RpAuthor	Ma, Yan ; Yuan, Fuping
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/94025
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, 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.