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

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-ductil...

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Veröffentlicht in:Journal of alloys and compounds 2019-10, Vol.806, p.992-998
Hauptverfasser: Sun, S.J., Tian, Y.Z., Lin, H.R., Dong, X.G., Wang, Y.H., Wang, Z.J., Zhang, Z.F.
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Sprache:eng
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Zusammenfassung: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. •The Hall-Petch relationships for CoCrFeMnNi high-entropy alloys (HEAs) were well fitted in large temperature range.•The Hall-Petch slope and friction stress of the CoCrFeMnNi HEAs have a negative relation with temperature.•Athermal contribution and grain size (d) follow a Hall-Petch relation, while thermal part is related to temperature and d.•Superior strength and ductility for CoCrFeMnNi HEAs were achieved by refining grain size and decreasing temperature.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.07.357