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- W4367318911 abstract "Here we fabricate a heterostructure in CrCoNi medium entropy alloy consisting of deformed substructures (the hard zone) and recrystallized ultrafine/fine grains (the soft zone). Mechanical tests reveal that the heterogeneous structure displays an exceptional combination of strength and ductility, especially at cryogenic condition, with a yield strength up to 1480 MPa and a uniform elongation of 28%. Such mechanical performance is primarily attributed to the zone boundary-dictated inhomogeneous deformation. Strain incompatibility-induced inter-zone interaction produces high internal stress near zone boundary, which leads to quick piling-up of geometrically necessary dislocations and consequently extra back stress strengthening. Cryogenic deformation further improves the internal stress, which helps to activate additional mechanical twinning and promotes the multiplication and interaction of defects, thereby contributing to high strain hardening at the large plastic stage. These findings suggest that heterostructured CrCoNi medium entropy alloy is a promising candidate for structural application over a wide temperature range." @default.
- W4367318911 created "2023-04-29" @default.
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- W4367318911 date "2023-07-01" @default.
- W4367318911 modified "2023-10-03" @default.
- W4367318911 title "Enhancing cryogenic tensile properties of CrCoNi medium entropy alloy via heterogeneous microstructure design" @default.
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- W4367318911 doi "https://doi.org/10.1016/j.matchar.2023.112951" @default.
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