期刊
MATERIALS LETTERS
卷 236, 期 -, 页码 416-419出版社
ELSEVIER
DOI: 10.1016/j.matlet.2018.10.144
关键词
Metals and alloys; Deformation and fracture; High entropy alloys; Phase transformation; Microstructure; Ductile-brittle transition
资金
- National Natural Science Foundation of China [51871178, 51621063, 51501145]
The mechanical behavior of (Fe40Mn40Co10Cr10)(100-x)C-x (x = 0, 2.2, 3.3 at.%) high entropy alloys (HEA) at various temperatures (298 K, 159 K and 77 K) was investigated. For Fe40Mn40Co10Cr10 HEA, the jointly activated twinning and martensitic phase transformation concurrently increase the strength and ductility at 77 K. In contrast, twinning and phase transformation gradually vanish as temperature decreases for carbon alloyed HEAs, resulting in ductile-brittle transition. Our findings indicate that the additional interstitial carbon atoms increase the f.c.c. phase stability, and inhibit the deformability of Fe40Mn40Co10Cr10 HEA at low temperature. (C) 2018 Elsevier B.V. All rights reserved.
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