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利用Gleeble-1500热力模拟试验机,在温度为650～950℃、应变速率为0.01～5 s-1、总应变量0.7的条件下,对W-50%Cu复合材料高温塑性变形过程中的动态再结晶行为及其热加工图进行了研究和分析。试验结果表明:W-50%Cu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W-50%Cu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;同时,利用W-50%Cu复合材料DMM加工图分析了其变形机制和失稳机制,可确定其热加工工艺优先选择变形温度650～700℃、应变速率1～5 s-1或变形温度850～950℃、应变速率0.01～0.1 s-1。
The dynamic characteristics of W-50% Cu composites during high-temperature plastic deformation were studied by using Gleeble-1500 thermal simulator at a temperature of 650-950 ℃, a strain rate of 0.01-5 s-1 and a total strain of 0.7. Recrystallization behavior and its hot working diagram were studied and analyzed. The experimental results show that the flow stress-strain curve of W-50% Cu composites is mainly characterized by dynamic recovery and dynamic recrystallization softening mechanism. The peak stress increases with the decrease of deformation temperature or strain rate. Based on the strain curve, the high-temperature deformation constitutive model of W-50% Cu composites was established to characterize its high-temperature rheological properties. At the same time, the deformation mechanism and loss of W-50% Cu composites were analyzed using DMM Stable mechanism, to determine the thermal processing technology preferred to choose the deformation temperature 650 ~ 700 ℃, strain rate 1 ~ 5 s-1 or deformation temperature 850 ~ 950 ℃, strain rate 0.01 ~ 0.1 s-1.