期刊
MATERIALS LETTERS
卷 236, 期 -, 页码 472-475出版社
ELSEVIER
DOI: 10.1016/j.matlet.2018.10.161
关键词
High entropy alloy; Heterogeneous; Friction stir processing; Strength; Ductility
资金
- National Science Foundation (NSF) [1435810]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1435810] Funding Source: National Science Foundation
A heterogeneous bimodal-grained AlxCoCrFeNi high entropy alloy was realized through friction stir processing (FSP) with the addition of Al powders. With the bimodal-grained structure and second phases, strength was increased and ductility was retained as compared with the friction stir processed base alloy. Face-centered cubic grains in the matrix were refined from similar to 500 mu m to similar to 15 mu m by FSP and subsequent recrystallization. With addition of Al powders, localized Al-rich regions facilitated the formation of body-centered cubic phase (Al, Ni-rich) and Al rich precipitates, which further refined grain size to similar to 5 mu m and enhanced local strength. (C) 2018 Elsevier B.V. All rights reserved.
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