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Superior dynamic shear properties by structures with dual gradients in medium entropy alloys

文献类型：期刊论文

作者Tan S(覃双); Yang MX(杨沐鑫); Jiang P(姜萍); Wang, Jian2; Wu XL(武晓雷); Zhou, Hao3; Yuan FP(袁福平)
刊名JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
出版日期2023-08-01
卷号153页码:166-180
ISSN号1005-0302
关键词Medium entropy alloys Gradient structures Precipitates Strain hardening Dynamic properties Adiabatic shear band
DOI10.1016/j.jmst.2023.01.014
英文摘要Structures with single gradient and dual gradients have been designed and fabricated in an Al 0.5 Cr 0.9 FeNi 2.5 V 0.2 medium entropy alloy. Structures with dual gradients (with increasing grain size and a decreasing volume fraction of nanoprecipitates from the surface to the center) were observed to show much better dynamic shear properties compared to both structures with single grain size gradient and coarse grained structures with homogeneously distributed nanoprecipitates. Thus, the dual gradients have a synergetic strengthening/toughening effect as compared to the sole effect of a single gradient and the sole precipitation effect. Initiation of the adiabatic shear band (ASB) is delayed and propagation of ASB is slowed down in structures with dual gradients compared to structures with single gradients, resulting in better dynamic shear properties. A higher magnitude of strain gradient and higher density of geometrically necessary dislocations are induced in the structures with dual gradients, resulting in extra strain hardening. Higher density dislocations, stacking faults, and Lomer Cottrell locks can be accumulated by the interactions between these defects and B2/L1 2 precipitates, due to the higher volume fraction of nanoprecipitates in the surface layer of the structures with dual gradients, which could retard the early strain localization in the surface layer for better dynamic shear properties. (c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
分类号一类
WOS研究方向Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000956100800001
资助机构National Natural Science Foundation of China [52192591, 12202459, 11790293] ; NSFC Basic Science Center Program [11988102] ; China Postdoctoral Science Foundation [2021M703292]
其他责任者Yuan, FP (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China. ; Yuan, FP (corresponding author), Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China.
源URL[http://dspace.imech.ac.cn/handle/311007/91854]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Tan S,Yang MX,Jiang P,et al. Superior dynamic shear properties by structures with dual gradients in medium entropy alloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2023,153:166-180.
APA 覃双.,杨沐鑫.,姜萍.,Wang, Jian.,武晓雷.,...&袁福平.(2023).Superior dynamic shear properties by structures with dual gradients in medium entropy alloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,153,166-180.
MLA 覃双,et al."Superior dynamic shear properties by structures with dual gradients in medium entropy alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 153(2023):166-180.

入库方式： OAI收割

来源：力学研究所

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