Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 18, Issue -, Pages 3777-3784Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2022.04.064
Keywords
High-entropy alloy; Compression test; Plastic deformation; Interface; Dislocations
Funding
- National Natural Science Foundation of China [51875241]
- Jilin Province Key RD Plan Project [YDZJ202101ZYTS129]
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The mechanical properties of mixed-phase high-entropy alloy were investigated at small scale using micro-pillar compression tests. It was found that the interfacial region of the mixed-phase pillars exhibited higher strength, which was attributed to the synergetic strengthening of incoherent and coherent interfaces.
Mechanical properties at small scale of mixed-phase Fe24Co25Ni24Cr23Al4 high-entropy alloy (HEA) were examined by micro-pillar compression tests in nano-indentation system. The micro-pillars with diameter of 400 nm were fabricated in the individual face centered cubic (FCC), body centered cubic (BCC) and their interfacial region employing a focused ion beam (FIB) technology. A combination of scanning electron microscope and transmission electron microscopy was performed on the deformed micro-pillars to determine the micro/nano structures. The interfacial pillars exhibited higher strength as compared with single BCC and FCC pillars according to the stress-strain responses during compression, which was attributed to the synergetic strengthening of FCC/BCC incoherent interface and A2/B2 coherent interface in mixed-phase pillar. The observed B2 particles inside BCC were induced by the spinodal decomposition. Moreover, a large number of dislocations pile-up against interface, indicative of the strengthening of the interface. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC
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