Super-high strength of a CoCrNiFe based high entropy alloy

doi:10.1016/j.jmst.2023.08.032

Abstract

Abstract: In the present work, a Co-rich CoCrNiFe based high entropy alloy doped with some additional elements W, Mo, Al, Ti and Nb was designed and prepared. The heterogenous microstructure, consisting of multi-scale precipitates, fine recrystallized grains and recovered grains with high density of dislocations, was formed in the alloy by thermo-mechanical processing. Tensile yield strength of the alloy can reach as high as 2.48 GPa with ∼3.5% elongation. It was discussed that the LI₂-γ′ precipitates, the high density of dislocations and grain boundaries play dominant roles in strengthening the alloy.

Key words: Tensile strength, High entropy alloy, Thermo-mechanical processing, Strengthening mechanisms, Heterogenous microstructure

Jiale Man, Baolin Wu, Guosheng Duan, Lu Zhang, Xinghao Du, Yandong Liu, Claude Esling. Super-high strength of a CoCrNiFe based high entropy alloy[J]. J. Mater. Sci. Technol., 2024, 177: 79-84.

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