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利用Gleeble-1500D热力模拟试验机,在温度为450~850℃、应变速率为0.001~1 s-1、真应变量0.7的条件下,研究和分析10 vol%TiC/Cu-Al2O3复合材料高温塑性变形及动态再结晶行为。结果表明,材料的高温流变应力-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降低或应变速率升高而增加,属于温度和应变速率敏感材料;材料热激活能为170.737 kJ/mol;其硬化率-应力(θ-σ)曲线均呈现拐点且-dθ/dσ-σ曲线出现极小值;临界应变随应变速率的增大及变形温度的降低而增加,且临界应变(εc)与峰值应变(εp)之间具有一定相关性,即εc/εp=0.704;临界应变与Z参数之间的函数关系为εc=1.48“10-2Z0.0765。
The thermal plasticity of 10 vol% TiC / Cu-Al2O3 composite was studied and analyzed by using Gleeble-1500D thermomechanical simulator at temperature of 450-850 ℃, strain rate of 0.001-1s-1 and true strain of 0.7. Deformation and dynamic recrystallization behavior. The results show that the stress-strain curves at high temperature are characterized by the dynamic recrystallization and softening mechanism. The peak stress increases with the decrease of deformation temperature or strain rate, which is a sensitive material with temperature and strain rate. The thermal activation energy of the material is 170.737 kJ / mol. The hardening rate-stress (θ-σ) curves all show inflexion points and the -dθ / dσ-σ curves show the minimum value. The critical strain increases with the increase of strain rate and deformation temperature, and the critical strain (εc) and peak strain (εp) have a certain correlation, that is εc / εp = 0.704; the critical strain and the Z parameter as a function of εc = 1.48 ”10-2Z0.0765.