Dynamic deformation behavior of a face-centered cubic FeCoNiCrMn high-entropy alloy
查看参考文献40篇
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文摘
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In this study, mechanical tests were conducted on a face-centered cubic FeCoNiCrMn high-entropy alloy, both in tension and compression, in a wide range of strain rates (10~(-4)–10~4 s~(-1)) to systematically investigate its dynamic response and underlying deformation mechanism. Materials with different grain sizes were tested to understand the effect of grain size, thus grain boundary volume, on the mechanical properties. Microstructures of various samples both before and after deformation were examined using electron backscatter diffraction and transmission electron microscopy. The dislocation structure as well as deformation-induced twins were analyzed and correlated with the measured mechanical properties. Plastic stability during tension of the current high-entropy alloy (HEA), in particular, at dynamic strain rates, was discussed in lights of strain-rate sensitivity and work hardening rate. It was found that, under dynamic conditions, the strength and uniform ductility increased simultaneously as a result of the massive formation of deformation twins. Specifically, an ultimate tensile strength of 734 MPa and uniform elongation of ~63% are obtained at 2.3 ×10~3 s~(-1), indicating that the alloy has great potential for energy absorption upon impact loading. |
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来源
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Science Bulletin
,2018,63(6):362-368 【核心库】
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DOI
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10.1016/j.scib.2018.01.022
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关键词
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High-entropy alloys
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Dynamic deformation
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Deformation twinning
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Work-hardening
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Plastic stability
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地址
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1.
University of Science and Technology Beijing, State Key Laboratory for Advance Metals and Materials, Beijing, 100083
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Max-Planck-Institut fur Eisenforschung, Germany, Dusseldorf, D-40237
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Institute of Mechanics, Chinese Academy of Sciences, State Key Laboratory of Nonlinear Mechanics, Beijing, 100190
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China Ship Development and Design Center, Wuhan, 430064
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Department of Mechanical Engineering, Kobe University, Japan, Kobe, 657-8501
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Department of Materials Science and Engineering, The University of Tennessee, USA, Knoxville, 37996
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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2095-9273 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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国家教育部高等学校学科创新引智计划项目
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International S&T Cooperation Program of China
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国家教育部长江学者与创新团队发展计划
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the Projects of SKL-AMM-USTB
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support from the Top-Notch Young Talents Program and the Fundamental Research Funds for the Central Universities
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support by US-NSF under contract
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文献收藏号
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CSCD:6217631
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