Mechanisms of plastic deformation of CoCrFeNi high-entropy alloy single crystals during solid solution hardening by Mo atoms A. V. Vyrodova, A. A. Saraeva, I. V. Kireeva, Y. I. Chumlyakov
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ArticleContent type: Текст Media type: электронный Subject(s): пластическая деформация | монокристаллы | высокоэнтропийные сплавыGenre/Form: статьи в журналах Online resources: Click here to access online
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AIP Conference Proceedings Vol. 2509. P. 020208-1-020208-5Abstract: The effect of alloying with Mo atoms 4 at % on the temperature dependence of critical resolved shear stresses (CRSS) τcr(T), strain hardening coefficient, plasticity and deformation mechanism was studied on [1¯11]-oriented crystals of the fcc CoCrFeNi (at %) high-entropy alloy (HEA) within the temperature range T = 77-973 K under tension. It was shown that during solid solution hardening by Mo atoms, the CRSS τcr increased by 45 and 23 MPa, respectively, at 77 and 296 K compared to crystals of this orientation of the equiatomic CoCrFeNiMn HEA. The onset of plastic deformation is associated with slip, and a planar structure with dislocation pile-ups was found at T = 77-296 K. At 77 K, with the development of twinning in one system simultaneously with slip, high values of Θ = dσ/dϵ = 1750 MPa and maximum stresses before failure σmax = 1650 MPa were found, and the plasticity was 57%. With an increase in the test temperature, deformation developed only by slip; Θ = dσ/dϵ, and σmax decreased, but the plasticity remained at the level of 50-57%.
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The effect of alloying with Mo atoms 4 at % on the temperature dependence of critical resolved shear stresses (CRSS) τcr(T), strain hardening coefficient, plasticity and deformation mechanism was studied on [1¯11]-oriented crystals of the fcc CoCrFeNi (at %) high-entropy alloy (HEA) within the temperature range T = 77-973 K under tension. It was shown that during solid solution hardening by Mo atoms, the CRSS τcr increased by 45 and 23 MPa, respectively, at 77 and 296 K compared to crystals of this orientation of the equiatomic CoCrFeNiMn HEA. The onset of plastic deformation is associated with slip, and a planar structure with dislocation pile-ups was found at T = 77-296 K. At 77 K, with the development of twinning in one system simultaneously with slip, high values of Θ = dσ/dϵ = 1750 MPa and maximum stresses before failure σmax = 1650 MPa were found, and the plasticity was 57%. With an increase in the test temperature, deformation developed only by slip; Θ = dσ/dϵ, and σmax decreased, but the plasticity remained at the level of 50-57%.
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