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Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures
文献类型：期刊论文
| 作者 | Ma Y(马彦); Yuan FP(袁福平) ; Yang MX(杨沐鑫); Jiang P(姜萍); Ma E; Wu XL(武晓雷)
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| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2018-04-15 |
| 卷号 | 148页码:407-418 |
| 关键词 | Medium-entropy alloys Dynamic shear properties Grain refinement Lomer-Cottrell locks Phase transformation |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2018.02.016 |
| 英文摘要 | Single-phase CrCoNi medium-entropy alloys (MEA) are emerging recently as an interesting class of metallic materials, but the dynamic response of this MEA at high strain rates remains unknown. Here we have produced this MEA with various heterogeneous microstructures, using cold rolling followed by annealing at various temperatures. The high-strain-rate response of the MEAs was characterized using hat-shaped specimens in Hopkinson-bar experiments. A combination of high dynamic shear yield strength and large uniform dynamic shear strain was observed, exceeding all other metals and alloys reported so far. Even better dynamic shear properties was revealed when the experiments were conducted at cryogenic temperature. The strong strain hardening under dynamic shear loading can be attributed to the dynamic grain refinement and deformation twinning that accompany the homogeneous shear deformation. When compared to room temperature, the efficiency of grain refinement was found to be enhanced at cryogenic temperature, with a higher density of multiple twins, stacking faults, Lomer-Cottrell locks, and hcp phase via phase transformation inside the grains, which could be responsible for the better dynamic shear properties under cryogenic environment. (c) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 分类号 | 一类 |
| URL标识 | 查看原文 |
| WOS关键词 | SEVERE PLASTIC-DEFORMATION ; ADIABATIC LOCALIZED SHEAR ; CENTERED-CUBIC METALS ; SOLID-SOLUTION ALLOYS ; MECHANICAL-PROPERTIES ; STRAIN-RATE ; GRADIENT STRUCTURE ; DAMAGE-TOLERANCE ; STEEL ; DUCTILITY |
| WOS研究方向 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000428823100039 |
| 资助机构 | National Key R&D Program of China [2017YFA0204402] ; National Natural Science Foundation of China [11472286, 11672313, 11790293, 11572328, 51701228, 51601204] ; Chinese Academy of Sciences [XDB22040503] |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/77820]  |
| 专题 | 力学研究所_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, 15 West Rd,North 4th Ring, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 3.Johns Hopkins Univ, Dept Mat Sci & Engn, 3400 North Charles St, Baltimore, MD 21218 USA |
| 推荐引用方式 GB/T 7714 | Ma Y,Yuan FP,Yang MX,et al. Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures[J]. ACTA MATERIALIA,2018,148:407-418. |
| APA | 马彦,袁福平,杨沐鑫,姜萍,Ma E,&武晓雷.(2018).Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures.ACTA MATERIALIA,148,407-418. |
| MLA | 马彦,et al."Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures".ACTA MATERIALIA 148(2018):407-418. |
入库方式： OAI收割
来源：力学研究所
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