1 State Key Laboratory of New Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China 2 School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093, China
Abstract: In this paper, Gleeble-3500 thermal simulator is used to study the high-temperature thermal deformation process of NiPt15 alloy. The defor-mation temperature of NiPt15 alloy is set to 950—1 150 ℃ and the deformation rate is 0.01 — 3 s-1. A hyperbolic sinusoidal Arrhenius constitutive model is established, and the dependence of the parameters on the strain is fitted, by analyzing the true stress-strain curve under different conditions during thermal deformation. Through the characterization of hot deformed microstructure and microhardness, the difference of hot deformation microstructure in each region of the sample was studied, and the effects of temperature, deformation rate, lnZ on dynamic recrystallization and Vickers hardness were analyzed. The results show that the true stress-strain curve of NiPt15 alloy includes three different changing trends, and the corresponding critical temperature value of the trend change at each deformation rate is different; the strain activation energy is not more than 476.85 kJ/mol. Increasing the temperature and reducing the deformation rate can increase the recrystallization ratio to complete dynamic recrystallization. The nucleation mechanism of NiPt15 alloy is discontinuous dynamic recrystallization, which mainly uses grain boundary bowing and repeated twinning to provide nucleation for recrystallized grains position. When lnZ is less than 38.89, the grain size has a negative correlation with lnZ. When lnZ is greater than 38.89, the relationship between the grain size and lnZ is not obvious; the hardness and lnZ have a positive correlation under the experimental conditions.
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2021, Vol. 35 
