作　　者： ; ; ; ; ; ; ;

机构地区： 河南科技大学材料科学与工程学院

出　　处： 《材料热处理学报》 2014年第8期1-6,共6页

摘　　要： 在Gleeble-1500D热模拟试验机上对Cu-Cr-Zr合金和Cu-Cr-Zr-Ce合金在应变速率为0.001~10 s-1、变形温度为650~850℃的高温变形过程中的流变应力行为进行了研究。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。从流变应力、应变速率和温度的相关性,利用逐步回归的方法建立了两种合金的流变应力方程。稀土元素Ce的加入能够细化Cu-Cr-Zr合金晶粒,而且能够促进Cu-Cr-Zr合金的动态再结晶。根据动态材料模型计算并分析了两种合金的热加工图,利用热加工图确定热变形的流变失稳区,并且获得了试验参数范围内热变形过程的最佳工艺参数,利用热加工图分析了两种合金不同区域的高温变形特征以及组织变化。对比分析后得出稀土元素Ce的加入能够优化Cu-Cr-Zr合金的热加工性能。 High temperature deformation behavior of Cu-Cr-Zr alloy and Cu-Cr-Zr-Ce alloys was investigated by compressive tests on a Gleeble-1500 D thermal-mechanical simulating tester at 650-850 ℃ and strain rates 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 constitutive equations for two kinds of alloys are obtained from the correlativity of flow stress,strain rate and temperature by stepwise regression analysis.The additions of Ce can make the grain refinement and accelerate the dynamical recrystalization effectively.With consideration of the effects of the deformation temperatures and the stain rates,processing maps are established based on the dynamic material model.The instability zones of flow behavior can be recognized by the plans.The optimurn processing parameters of hot defomation in the range of this experiment can also be attained by the plans.The hot deformation characteristics and microstructure are also analyzed by the processing maps.The additions of Ce can optimize the hot workability of Cu-Cr-Zr alloy.

关 键 词： 合金 高温压缩 流变应力方程 动态再结晶 热加工图

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]