MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Solidification Rate on the Microstructure and Strain-Rate-Sensitive Mechanical Behavior of AlCoCrFeNi High-Entropy Alloy Prepared by Bridgman Solidification
Xutao WangYakai ZhaoJinlian ZhouYunfei XueFangqiang YuanLili MaTangqing CaoLu Wang
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2019 Volume 60 Issue 6 Pages 929-934

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Abstract

AlCoCrFeNi high-entropy alloys (HEAs) were prepared by Bridgman solidification with different solidification rates, and the mechanical behavior of the HEAs was investigated over a wide strain rate range (∼10−3∼103 s−1). Microstructure observations suggest that, with increasing solidification rate, the microstructure evolves from coarse columnar grains to fine equiaxed ones. Through compression tests under both quasi-static and dynamic strain rates, the AlCoCrFeNi HEAs were found to possess positive strain-rate sensitivity (SRS), and the HEA with lower solidification rate exhibits higher SRS, which are attributed to the coarse grain size.

Fig. 1 Optical micrographs of the AlCoCrFeNi HEA by Bridgman solidification: (a) H200 alloy; (b) H1200 alloy; (c) H2400 alloy; (1) cross section; (2) longitudinal section. Fullsize Image
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© 2019 The Japan Institute of Metals and Materials
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