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利用Gleeble-1500D热力模拟试验机,在变形温度为350～750℃、应变速率为0.01～5 s-1、总应变量约为0.5的条件下,对复合材料的高温热变形行为及动态再结晶临界条件进行研究。结果表明:弥散铜-WC复合材料高温流动应力-应变曲线主要以动态回复和动态再结晶软化机制为特征,峰值应力随变形温度的降低或应变速率的升高而增加;在真应力-应变曲线基础上,建立的Al2O3/Cu-WC复合材料高温变形本构模型较好地表征了其高温流变特性,其热激活能为208.35 kJ/mol;同时,利用其θ-σ曲线出现拐点及-dθ/dσ曲线上出现最小值研究了动态再结晶的临界条件。
The hot deformation behavior and dynamic recrystallization of the composites were investigated by Gleeble-1500D thermomechanical simulator at a deformation temperature of 350-750 ℃, a strain rate of 0.01-5 s-1 and a total strain of about 0.5. Critical conditions for research. The results show that the flow-stress-strain curves of the dispersed copper-WC composites are mainly characterized by dynamic recovery and dynamic recrystallization softening mechanism. The peak stress increases with the decrease of the deformation temperature or the strain rate. In the true stress-strain curve Based on the established high-temperature deformation constitutive model of Al2O3 / Cu-WC composites, the high-temperature rheological properties of the composites were well characterized and their thermal activation energy was 208.35 kJ / mol. At the same time, The minimum value of dθ / dσ curve is used to study the critical condition of dynamic recrystallization.