Details

Autor(en) / Beteiligte

• Sun, S.J.
• Tian, Y.Z.
• Lin, H.R.
• Dong, X.G.
• Wang, Y.H.
• Wang, Z.J.
• Zhang, Z.F.

Titel

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

Ist Teil von

• Journal of alloys and compounds, 2019-10, Vol.806, p.992-998

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.