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Constitutive equation and processing map of CuNi10Fe1Mn alloy based on high-temperature deformation behavior

The thermodynamic behavior of a CuNi10Fe1Mn alloy was investigated by isothermal compression from 1123–1273 K and in a strain-rate range of 0.1–10 s−1. The rheological constitutive equation of the CuNi10Fe1Mn alloy was constructed by using the Arrhenius formula and the Zener–Honllmon parameters, and a thermal-processing map was established based on the dynamic materials model (DMM). The results show that the flow stress increases with an increase in strain rates, whereas it decreases with an increase in temperature. The CuNi10Fe1Mn alloy has two processing instability zones and a safe processing zone. The first zone of instability corresponds to 1123–1200 K and the strain rate range is 0.3–5 s−1. The second zone of instability corresponds to 1200–1273 K and the strain-rate range is 0.3–5 s−1. The optimal temperature for the hot deformation of the CuNi10Fe1Mn alloy is 1200–1273 K and the strain rate is −0.1–0.3 s−1.