期刊
MATERIALS & DESIGN
卷 90, 期 -, 页码 601-609出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.11.013
关键词
High-entropy alloys; Spinodal decomposition; Microstructure; Strain rate; Mechanical properties
资金
- National Natural Science Foundation of China [51471035]
- International Science and Technology Cooperation Project of Beijing Institute of Technology
- Beijing Higher Education Young Elite Teacher Project
AlxSi0.2CrFeCoNiCu1 (- x) (x = 0.2, 0.4, 0.5, 0.6, 0.8, 0.9) high-entropy alloys (HEAs) were prepared using vacuum arc melting and injection casting. The microstructures, detailed phases, and strain rate-related mechanical properties of the alloys were investigated. The alloys changed gradually from FCC to coexisting FCC and BCC and then to a BCC solid solution with an increase in the Al content and a decrease in the Cu content. With the Al content increase, the alloys with FCC structures exhibited an increased yield stress but a decreased plasticity. However, the alloys with the BCC structure exhibited both increased strength and plasticity. The improved mechanical properties of alloys are attributed to the combined action of solid-solution strengthening, a decrease in compositional segregation, and fine-grain strengthening. (C) 2015 Elsevier Ltd. All rights reserved.
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