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在Gleeble-1500D热模拟试验机上对Cu-Al2O3复合材料进行等温压缩试验,研究了变形温度600～950℃,应变速率0.001～1 s-1条件下的热变形行为。结果表明,Cu-Al2O3复合材料的流变应力-应变曲线是典型的动态再结晶类型,流变应力随应变量的增加均呈现先增大后减小,之后达到一个稳定的趋势。热变形过程中的稳态流变应力可用双曲正弦本构方程.ε=8.909×105[sinh(0.012486σ)]5.4343.exp[-133.02/(RT)]来表示。根据动态材料模型以及DMM加工图理论,建立了Cu-Al2O3复合材料的热加工图,据此确定Cu-Al2O3复合材料的最佳热变形工艺参数范围为:变形温度850～950℃,应变速率0.01～0.1 s-1。
The isothermal compression tests of Cu-Al2O3 composite on a Gleeble-1500D thermal simulator were carried out to study the thermal deformation behavior under the temperature of 600 ~ 950 ℃ and the strain rate of 0.001 ~ 1 s-1. The results show that the flow stress-strain curve of Cu-Al2O3 composites is a typical type of dynamic recrystallization. The flow stress increases first and then decreases with the increase of strain amount, and then reaches a steady trend. Steady-state flow stress during hot deformation can be expressed by the hyperbolic sine constitutive equation ε = 8.909 × 105 [sinh (0.012486σ)] 5.4343.exp [-133.02 / (RT)]. According to the dynamic material model and the DMM processing diagram theory, the hot working diagram of Cu-Al2O3 composite material is established, and the optimum technological parameters of Cu-Al2O3 composite material are determined as follows: deformation temperature 850 ~ 950 ℃, strain rate 0.01 ~ 0.1 s-1.