About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Heterostructured and Gradient Materials (HGM IV): Tailoring Heterogeneity for Superior Properties
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Presentation Title |
Cu-Fe Based Immiscible Medium-entropy Alloys with Excellent Tensile Properties |
Author(s) |
Jongun Moon, Jeong Min Park, Jae Wung Bae, Peter Liaw, Hyoung Seop Kim |
On-Site Speaker (Planned) |
Jongun Moon |
Abstract Scope |
In the present work, Cu-Fe based immiscible medium-entropy alloys with excellent mechanical properties are proposed. Alx(CuFeMn)100-x (x = 0, 7.5, and 15 atomic percent, at.%) alloys were developed by utilizing the immiscible nature of Cu-Fe alloys. The phase separation into Cu-rich and Fe-rich dual domains induces microstructural and compositional heterogeneities to the alloys, and the addition of Al transforms the crystal structure from dual face-centered-cubic to face-centered-cubic and L21 structures. The alloys exhibit high strengths because of hetero-deformation-induced strengthening caused by heterogeneous microstructures. The presence of nano-scale twins also enhances the strength of the alloys. In particular, the twinning-mediated martensitic phase transformation from L21 to 18R-type martensite phases plays a significant role in strengthening the alloys at cryogenic temperatures. |
Proceedings Inclusion? |
Planned: |