摘要
采用Gleeble-1500热模拟实验机对Cu-0.92Cr-0.068Zr合金进行高温热压缩实验,研究该合金在变形温度为500～800℃、应变速率为0.01～1 s-1工作条件下的流变应力行为和组织演变。结果表明:变形温度和应变速率对合金的高温变形有显著影响,流变应力随变形温度的升高而降低,随应变速率的降低而减小;流变曲线表现出动态回复和动态再结晶两种特征。可用包含Zener-Hollomon参数的Arrhenius双曲正弦函数算出Cu-0.92Cr-0.068Zr热变形激活能和高温热变形流变应力本构方程。合金形变组织受变形温度影响强烈。
Flow stress behavior and microstructure of a Cu-0.92Cr-0. 068Zr alloy hot-deformed in the temperature range of 500 -800 ℃ with strain rate of 0.01 -1 s-1 was studied by thermal simulation test on a Gleeble-1500 thermal-mechanical simulator. The results show that the deformation temperature and the strain rate have great influence on deformation behavior of the alloy at high temperature. Flow stress decreases with the increasing of deformation temperature and the decreasing of strain rate. The flow stress curves show the characteristics of both dynamic recovery and dynamic reerystallization. The hot deformation activation energy and flow stress constitutive equation are derived by hyperbolic sine equation containing Zener-Hollomon parameter. The deformation temperature exhibits significant effect on microstructure of the deformed alloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第5期6-10,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(50571035)
河南省高校科技创新团队支持计划(2012IRTSTHN008)
河南省高等学校青年骨干教师资助计划(09003047)
河南科技大学科研创新培育基金(2010CZ0008)
