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利用Gleeble-1500热力模拟试验机,获得了20 vol%TiC颗粒增强弥散铜基复合材料在温度为450～850℃、应变速率为0.001～1 s-1的真应力-应变数据。采用加工硬化率处理方法,研究了该复合材料的动态再结晶行为。结果表明,该材料的真应力-应变曲线主要以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;该材料的lnθ-ε曲线出现拐点,-(lnθ)/ε-ε曲线均出现极小值;峰值应变和临界应变均随变形温度的升高与应变速率的降低而减小;临界应变与峰值应变之间具有相关性,即εc/εp=0.5276。
The true stress-strain data of 20 vol% TiC particle reinforced Cu-based composites at 450 ~ 850 ℃ and strain rate of 0.001 ~ 1 s-1 were obtained by using Gleeble-1500 thermal simulator. The work hardening rate treatment method was used to study the dynamic recrystallization behavior of the composites. The results show that the true stress-strain curve of the material is mainly characterized by the dynamic recrystallization softening mechanism. The peak stress increases with the decrease of the deformation temperature or the strain rate. The lnθ-ε curve of the material has an inflection point, lnθ) / ε-ε curves show a minimum; the peak strain and the critical strain both decrease with the increase of the deformation temperature and the strain rate; and there is a correlation between the critical strain and the peak strain, that is εc / εp = 0.5276.