(南昌大学 材料科学与工程学院，南昌 330031)
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。
关键字: Cu-Cr-Zr-Mg合金；析出贯序；时效；有序化；共格界面；位向关系
（School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China）
Abstract: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.
Key words: Cu-Cr-Zr-Mg alloy; precipitation sequence; aging; ordering; coherent interface; orientation relationship
