作　　者： ; ; ; ; ; ; ;

机构地区： 河南科技大学材料科学与工程学院

出　　处： 《中国稀土学报》 2013年第6期710-715,共6页

摘　　要： 红Gleeble一1500D热模拟试验机㈧口Cu—Gr—Zr和Cu-Cr-Zr-Ce合金在应变速率为0．001～10s^-1、变形温度为650～8500℃的高温变彤过程中的流变应力行为进行了研究。利用光学显微镜分析了合金在热变形过程中的组织演变及动态阿结晶机制。结果表明：流变应力随变形温度的升高m减小，随应变速率的提高而增大。升高变形溢度以及降低应变速率，均有利于Cu，Cr，Zr和Cu—Xr-Zr-Ce合会的动态再结晶发生。从流变应力、应变速率和温度的相关性，得出了两种合金高温热儿三缩变形时的热变形激活能Q为392．5和495．8kJ·mol^-1。稀土元素Ce的加入能够细化Cu-Cr-Zr合金编粒，而且能够促进Cu-Cr-Zr合金的动态再结晶。 The high temperature deformation behaviors of Cu-Cr-Zr and Cu-Cr-Zr-Ce alloys were investigated by compressive tests on Gleeble-1500D thermal-me- chanical simulating tester in the temperatures range of 600 -800 ℃, strain rate range of 0. 001 - 1 - 10 s^-1. The microstructure evolution and dynamic recrystalli- zation nucleation mechanisms of Cu-Cr-Zr and Cu-Cr- Zr-Ce alloys were analyzed. The results showed that the flow stress decreased with the increase of temperature while increased with the Both the increase of deformati decrease of strain rate are good zation. The hot deformation increase of strain rate. on temperature and the for dynamic recrystalli- activation energy Q = 392.5 and 495.8 kJ·mol^-1 respectively for Cu-Cr-Zr and Cu-Cr-Zr-Ce alloys were obtained from the correlativity of flow stress, strain rate and temperature stepwise regression analysis.

关 键 词： 高温压缩 动态再结晶 热激活能 稀土

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]