Tensile behaviors and hetero-deformation-induced hardening mechanisms in medium entropy alloys with dual gradients of grain size and coherent nanoprecipitate

doi:10.1016/j.matchar.2023.113372

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Tensile behaviors and hetero-deformation-induced hardening mechanisms in medium entropy alloys with dual gradients of grain size and coherent nanoprecipitate
	Zhang, Zihan 1,2; Wu, Xiaolei 1,2; Yuan, Fuping 1,2
刊名	MATERIALS CHARACTERIZATION
	2023-11-01
卷号	205 页码:13
关键词	High/medium entropy alloys Heterogeneous structures Gradient structure Precipitation hardening Strengthening Ductility
ISSN号	1044-5803
DOI	10.1016/j.matchar.2023.113372
通讯作者	Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
英文摘要	Heterogeneous structures with dual gradients of grain size and coherent L12 nanoprecipitation have been designed and fabricated in a Co34.46Cr32.12Ni27.42Al3Ti3 medium entropy alloy. These heterogeneous structures with dual gradients show improved tensile properties over both the single grain-size gradient structure and the coarse grained structures with homogeneously distributed L12 nanoprecipitates. Hetero-deformation-induced hardening rate was observed to be higher and the strain hardening capacities at each depth were also found to be higher in the structures with dual gradients, as compared to the single grain-size gradient structure. Deformation twins and stacking faults were observed at both the topmost and center layers, while deformation bands at two directions were only found at the topmost layer after tensile deformation in the single grain-size gradient structure. Strong interactions between defects and coherent L12 nanoprecipitates can be observed at all depths after tensile deformation in the structures with dual gradients, resulting in strong precipitation hardening. While, stronger precipitation hardening was achieved at the topmost layer due to the higher volume fraction and smaller spacing of coherent L12 nanoprecipitates, which could delay the early necking trend at the topmost layer for better tensile ductility in the structures with dual gradients.
资助项目	NSFC[11988102] ; National Key R & D Program of China[2019YFA0209902] ; National Science Foundation of China[52192591]
WOS关键词	SEVERE PLASTIC-DEFORMATION ; SHORT-RANGE ORDER ; STRENGTH ; DUCTILITY ; CRCONI ; STRESS ; STEEL
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:001106434600001
资助机构	NSFC ; National Key R & D Program of China ; National Science Foundation of China
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/93487]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Yuan, Fuping
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zihan,Wu, Xiaolei,Yuan, Fuping. Tensile behaviors and hetero-deformation-induced hardening mechanisms in medium entropy alloys with dual gradients of grain size and coherent nanoprecipitate[J]. MATERIALS CHARACTERIZATION,2023,205:13.
APA	Zhang, Zihan,Wu, Xiaolei,&Yuan, Fuping.(2023).Tensile behaviors and hetero-deformation-induced hardening mechanisms in medium entropy alloys with dual gradients of grain size and coherent nanoprecipitate.MATERIALS CHARACTERIZATION,205,13.
MLA	Zhang, Zihan,et al."Tensile behaviors and hetero-deformation-induced hardening mechanisms in medium entropy alloys with dual gradients of grain size and coherent nanoprecipitate".MATERIALS CHARACTERIZATION 205(2023):13.