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Abstract Microstructure and tensile properties of Fe20Mn20Cr20Ni20Co20, Fe20Mn20Cr20Ni20Co20-xCx and Fe20Mn20Cr20Ni20Co20-xNx (x = 1 at.% and 3 at.%) high-entropy cast alloys have been studied. Interstitial-doped alloys possess an austenitic structure with expanded crystal… Click to show full abstract
Abstract Microstructure and tensile properties of Fe20Mn20Cr20Ni20Co20, Fe20Mn20Cr20Ni20Co20-xCx and Fe20Mn20Cr20Ni20Co20-xNx (x = 1 at.% and 3 at.%) high-entropy cast alloys have been studied. Interstitial-doped alloys possess an austenitic structure with expanded crystal lattice and dendritic segregations of the alloying elements. Alloying with 1 at.% of C or N provides high solid-solution strengthening effects. Despite inhomogeneous dendritic microstructure, a yield strength and an elongation (349 MPa and 59%) in Fe20Mn20Cr20Ni20Co17N3 alloy exceed those for N-free alloy (163 MPa and 55%). Carbon-alloying produces more inhomogeneous microstructure and a precipitate hardening as compared to nitrogen-alloying and is accompanied with embrittlement of Fe20Mn20Cr20Ni20Co17C3 alloy.
Journal Title: Materials Letters
Year Published: 2020
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