Elsevier

Scripta Materialia

Volume 163, 1 April 2019, Pages 152-156
Scripta Materialia

Superior cryogenic tensile properties of ultrafine-grained CoCrNi medium-entropy alloy produced by high-pressure torsion and annealing

https://doi.org/10.1016/j.scriptamat.2019.01.016Get rights and content

Abstract

Ultrafine-grained materials with nanotwins are expected to produce a remarkable combination of strength and ductility. In the present study, ultrafine-grained CoCrNi medium-entropy alloy with nanotwins is fabricated by high-pressure torsion followed by annealing; and investigated for cryogenic tensile properties. The alloy exhibits superior cryogenic tensile properties with a tensile strength of ~2 GPa and tensile strain of ~27%. The cryogenic tensile strength of ultrafine-grained sample increased by 67% as compared to the cryogenic tensile strength of coarse-grained sample due to fine grain size, annealing nanotwins, residual dislocation density, and strong temperature dependence of yield strength.

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Funding

This research was supported by the Future Materials Discovery Project through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF- 2016M3D1A1023383). Dr. S. Praveen is supported by the Korea Research Fellowship program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2017H1D3A1A01013666).

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