Temperature dependence of the Hall–Petch relationship in CoCrFeMnNi high-entropy alloy

By S.J. Sun, Y.Z. Tian, H.R. Lin, X.G. Dong, Y. Wang, Z.J. Wang, Z. Zhang. Journal of Alloys and Compounds, 2019

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Abstract Single-phase equiatomic CoCrFeMnNi high-entropy alloy (HEA) specimens with three different grain sizes (0.65 μm, 2.1 μm and 105 μm) were processed by cold rolling and annealing treatment. Tensile properties were investigated over a broad temperature range from 77 K to 873 K. Superior strength-ductility balance can be achieved by refining grain size and decreasing temperature. The Hall-Petch relationship was well fitted, and the fitting parameters have a negative relation with temperature. The thermal and athermal contributions to the yield strength were revealed. This work has unveiled the superior mechanical property of HEAs at cryogenic temperatures.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/b33fd98188218e761c8d1f9d0a9a0ab58bbfdfff