摘要
通过将QCr0.5铜合金在不同温度下进行时效处理,分析其析出相时效析出过程,结果表明:QCr0.5铜合金在固溶变形处理后,400℃及以下由于析出动力不足,难以形成有效的析出相结构,材料保持形变结构特征;425℃时效2 h材料内部形成GP区,450℃开始析出共格的纳米析出相,475℃纳米析出相的析出比较均匀,大小在4～6 nm左右,材料的强度和导电率均达到较高的水平;当温度升至500℃时,2 h时效后析出相出现共格失配现象,随着温度的进一步提高,析出相开始长大,完全失去共格效应,同时材料的硬度出现明显的下降。
Precipitate evolution of precipitate in a QCr0.5 copper alloy during aging at different temperatures was analyzed. The results show that no significant precipitates are observed and the solid-solutioned and deformed microstructure is maintained for the QCr0. 5 copper alloy after aging at 400℃ , GP zones are formed for the alloy after aging at 425 ℃ for 2 h, coherent nano precipitate phase is detected in the alloy aged at 450 ℃, and coherent nanoparticles of precipitate phase with size of 4-6 nm and uniform distribution are found in the aged alloy at 475 ℃. The strength and electrical conductivity of the material aged at 475 ℃ exhibit a higher level. When the aging temperature increases to 500 ℃, non-coherent precipitate phase forms and with further increasing of the temperature the precipitate phase begins to grow, while the hardness of the alloy decreases markedly.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2012年第6期47-50,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学青年基金(50801021)
河南省教育厅自然科学基础研究项目(2010B430010)
关键词
QCr0.5
时效
析出相
共格
纳米相
QCr0. 5 copper alloy
aging
precipitation phase
coherent
nano-scale precipitation
