Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation

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Abstract

The equiatomic CrMnFeCoNi high-entropy alloy (HEA) exhibits outstanding toughness and excellent strength-ductility combination at cryogenic temperatures. However, its strength is relatively low at room temperature. In order to strengthen this HEA, microalloying additions of 0.8 at.% Nb and C were made and its properties and microstructure evaluated. It was found that the microalloying resulted in the formation of carbide precipitates and a reduction of the grain size to ∼2.6 μm. As a result, the room-temperature tensile yield strength (732 MPa) of the microalloyed HEA is roughly double that of the base HEA (with a concomitant increase in the ultimate strength) while its ductility is maintained at a relatively high level (elongation to fracture of ∼32%). The strengthening is due to precipitation hardening from the nanoscale carbide particles and grain refinement.

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Gao, N., Lu, D. H., Zhao, Y. Y., Liu, X. W., Liu, G. H., Wu, Y., … George, E. P. (2019). Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation. Journal of Alloys and Compounds, 792, 1028–1035. https://doi.org/10.1016/j.jallcom.2019.04.121

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