作　　者： ; ;

机构地区： 河南科技大学材料科学与工程学院

出　　处： 《功能材料》 2013年第5期623-626,631,共5页

摘　　要： 通过高温等温压缩试验,对Cu-Ni-Si-Ag合金在应变速率为0.01～5s-1、变形温度为600～800℃的动态再结晶行为以及组织转变进行了研究。结果表明,在应变温度为750、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。同时从流变应力、应变速率和温度的相关性,得出了该合金高温热压缩变形时的热变形激活能Q和流变应力方程。并综合考虑应变速率与温度的影响,采用动态材料模型建立了该合金的热加工图,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。 High temperature compressive experiments of Cu-Ni-Si-Ag alloy at 0.01 5s-1 and 600-800℃ were per- formed. The results showed that when the deformation temperature was 750 and 800℃, the flow stress de- creased after a peak value,showing continuous dynamic recrystallization. The hot deformation activation energy Q,and constitutive equation were obtained from the correlativity of flow stress, strain rate and temperature. With consideration of the effects of the deformation temperatures and the stain rates, processing maps were es- tablished based on the dynamic material model. The hot deformation characteristics and mierostructures were al- so analyzed by the processing maps.

关 键 词： 合金 热加工图 动态再结晶 流变应力方程

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]