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》 2012年第6期47-50,共4页

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.

关 键 词： 时效 析出相 共格 纳米相

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺] [金属学及工艺] [金属学及工艺]