Cu-Cr-Zr-Mg合金早期时效析出贯序  

Precipitation sequence of Cu-Cr-Zr-Mg alloy during early aging stage

作　　者：余方新[1] 程建奕[1] 沈斌[1] 

机构地区：[1]南昌大学材料科学与工程学院,南昌330031

出　　处：《中国有色金属学报》2013年第12期3360-3366,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51161018)

摘　　要：通过透射电镜和高分辨透射电镜研究Cu-0.69Cr-0.10Zr-0.02Mg合金在450℃早期时效的析出贯序。研究表明:合金在450℃早期时效的析出贯序为过饱和固溶体→溶质偏聚→FCC富Cr的GP区(Ⅰ)→FCC有序富Cr的GP区(Ⅱ)→BCC有序富Cr相。在脱溶演变过程中,析出相和基体之间的界面由完全共格界面向共格半共格界面转变,位向关系由立方立方向Nishiyama-Wassermann位向关系转变。共格界面的形成有利于FCC富Cr相的形成。富Cr析出相的有序化加速析出进程,并有利于BCC相的形成,促进了Nishiyama-Wassermann位向关系的发展。The precipitation process in Cu-0.69Cr-0.10Zr-0.02Mg alloy during the early aging stage at 450 ℃ was investigated by transmission electron microscopy and high resolution transmission electron microscopy. The precipitation sequence in the Cu-Cr-Zr-Mg alloy aged at 450 ℃ is supersaturated solid solution → solution segregation → GP zone（Ⅰ）（FCC Cr-rich phase） → GP zone（Ⅱ）（ordered FCC Cr-rich phase） → ordered BCC Cr-rich phase. In the evolution of decomposition,the interface between the precipitates and the Cu matrix changes from the full coherent one to the coherent-partial coherent one,and the orientation relationship changes from the cube-on-cube to Nishiyama-Wassermann. The coherent interface between the FCC Cr-rich precipitates and Cu matrix facilitates the formation of the FCC precipitates. The ordering of Cr-rich precipitates accelerates the precipitation process,which facilitates the formation of the BCC precipitates and promotes the development of Nishiyama-Wassermann orientation relationship.

关 键 词：CU-CR-ZR-MG合金 析出贯序 时效 有序化 共格界面 位向关系 

分 类 号：TG146[一般工业技术—材料科学与工程]