摘要
在Gleeble-1500D热模拟试验机上对Cu-Cr-Zr-Ag合金进行高温等温压缩试验,当热压缩应变速率为0.001~10 s-1、热变形温度为650~950℃时,同时对合金高温热压缩的热加工图以及变形机制进行研究。结果表明:流变应力随变形温度的升高而减小,随应变速率的提高而增大;热变形过程中的稳态流变应力可用双曲正弦本构关系式来描述,其激活能为Q=343.23 k J/mol,同时利用逐步回归的方法建立了该合金的流变应力方程。根据动态材料模型计算并分析了合金的热加工图,并且获得了试验参数范围内热变形过程的最佳工艺参数:温度为750~800℃、应变速率范围为0.01~0.1 s-1,并利用热加工图分析了该合金不同区域的高温变性特征以及组织变化。
The high temperature deformation mechanism and hot processing map of Cu-Cr-Zr-Ag alloy were investigated by compressive tests on Gleeble?1500D thermal-mechanical simulating tester in the temperatures range of 650?950℃, strain rate range of 0.001?10 s?1. The results show that the flow stress decreases with the increase of temperature, while increases with the increase of strain rate. The flow behavior is described by the hyperbolic sine constitutive equation and the activation energy of the alloy is Q=343.23 kJ/mol. The constitutive equation is obtained by stepwise regression analysis. The processing maps were established based on the dynamic material model. The optimum processing parameters of hot deformation in the range of this experiment can also be attained by the plans,in which the hot temperature is 750?800 ℃ and the strain rate is 0.01?0.1 s?1. The hot deformation characteristics and microstructures were also analyzed by the processing maps.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2015年第4期931-937,共7页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51101052)
国家高新技术研究发展计划资助项目(2006AA03Z528)
河南省高等学校青年骨干教师资助计划(2012GGJS-073)
河南省教育厅自然科学研究计划(2011B430013)
河南科技大学青年科学基金资助项目(2011QN48)
