Cu-Cr-Zr合金高温热变形行为研究  

Study on Hot Deformation Behaviors of Cu-Cr-Zr Alloy

作　　者：樊建荣[1] 朱军[1] 李瑞卿[1] FAN Jian-rong ZHU Jun LI Rui-qing(Yanan Vocational ＆ Technical College, Yanan 716000, Shaanxi, China)

机构地区：[1]延安职业技术学院,陕西延安716000

出　　处：《铸造》2017年第2期182-185,191,共5页Foundry

基　　金：湖北省自然科学基金项目(2015A030313207)

摘　　要：在Gleeble-1500D热模拟试验机上,采用高温等温压缩试验,对Cu-Cr-Zr合金在变形温度为600~800℃、应变速率为0.01~5 s^(-1)和总压缩应变量约50%条件下的热变形行为进行了研究。利用光学显微镜观察Cu-Cr-Zr合金在不同变形温度、不同应变速率下的显微组织,分析其组织演变规律。结果表明:应变速率和变形温度的变化强烈地影响合金流变应力的大小;Cu-Cr-Zr合金在热变形过程中发生了动态再结晶,且流变应力随变形温度升高而降低,随应变速率提高而增大;在应变温度为800℃时,合金热压缩变形流变应力出现了明显的峰值应力,表现为连续动态再结晶特征。从流变应力、应变速率和温度的相关性,得出了该合金热压缩变形时的热变形激活能Q和流变应力方程。The hot deformation behavior of Cu-Cr-Zr alloy during hot compression deformation was studied by isothermal compression test at Gleeble-1500D thermal-mechanical simulator at the temperature from 600 ℃ to 800℃ and at the strain rate from 0.01 s-1 to 5 s-1 under the maximum strain of 50%. The microstructure of Cu-Cr-Zr alloy was observed under different deformation temperatures and strain rates, the microstructure evolution of Cu-Cr-Zr alloy was studied. The results show that the flow stress is strongly influenced both by deformation temperature and stain sate. The dynamic recrystallization occurred during the test. The flow stress decreases with the increase of deforming temperature, while increases with the increase of strain rate. When the deformation temperature is 800℃, the flow stress decreased after a peak value, showing continuous dynamic recrystallization. Both the hot deformation activation energy Q and constitutive equation were derived from the correlativity of flow stress, strain rate and temperature.

关 键 词：CU-CR-ZR合金 热压缩 流变应力 动态再结晶 

分 类 号：TG146.11[一般工业技术—材料科学与工程]