Microstructural Evolution and Twinning Mechanism in Cold-Drawn CoNiV Medium-Entropy Alloy

Lin Deng; Jinru Luo; Rongzhi Li; Yong Zhang

Abstract

The microstructural evolution of a CoNiV medium-entropy alloy (MEA) during cold drawing was investigated. The alloy maintains a single-phase FCC structure, with annealing twins in the as-annealed state and deformation twins forming after drawing. Despite its high stacking fault energy, the applied drawing stress (2410 MPa) exceeds the critical twinning stress (1903 MPa), enabling deformation twinning. No 9R phase was observed, which is attributed to its thermodynamic instability, as confirmed by first-principles calculations. These findings clarify the deformation behavior and twin formation mechanism in CoNiV MEAs under severe plastic deformation.

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