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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。
The aging process of the precipitated phase of QCr0.5 copper alloy was analyzed by aging treatment at different temperatures. The results show that it is difficult to form effective QCr0.5 copper alloy at 400 ℃ and below due to insufficient precipitation power after solution treatment . The GP zone was formed within 425 ℃ for 2 h, and the coherent nano-precipitates were precipitated at 450 ℃. The precipitation of 475 ℃ nano-precipitates was uniform and the size was about 4 ~ 6 nm , The strength and electrical conductivity of the materials reach a higher level. When the temperature rises to 500 ℃, the precipitated phase appears the mismatch phenomenon after 2 h aging. With the further increase of the temperature, the precipitated phase begins to grow and completely lose Co-pass effect, while the material hardness decreased significantly.