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在Gleeble-3500热模拟机上采用等温压缩实验研究了ZnAl10Cu2合金在温度为210～300℃、应变速率为10-2～10 s-1条件下的热变形行为,获得了该合金热变形过程中的真应力-应变曲线。结果表明:ZnAl10Cu2合金的峰值流变应力随温度升高而降低,随应变速率的提高而增大。通过双曲正弦模型确定了该合金的高温材料常数,Q=144.161 kJ/mol,n=4.443,A=4.7×1012s-1,α=0.01037 MPa-1,并采用修正的Kumar模型建立了考虑应变对流变应力影响的高温本构关系,其拟合度为9.14%。
The thermal deformation behavior of ZnAl10Cu2 alloy at 210-300 ℃ and strain rate of 10-2-10 s-1 was studied by isothermal compression experiment on Gleeble-3500 thermal simulator. The thermal deformation behavior of ZnAl10Cu2 alloy during hot deformation was obtained True stress - strain curve. The results show that the peak flow stress of ZnAl10Cu2 alloy decreases with increasing temperature, and increases with increasing strain rate. The high-temperature material constants of the alloy were determined by hyperbolic sinusoidal model with Q = 144.161 kJ / mol, n = 4.443, A = 4.7 × 1012s-1 and α = 0.01037 MPa-1. The high-temperature constitutive relationship that affects the flow stress is 9.14%.