冷却速度对CuCr25合金凝固过程的影响(英文)

Effects of Cooling Rates on Solidification of CuCr25 Alloys

研究了不同冷却速度下 CuCr25 合金的微观组织和凝固过程。随着冷却速度的增加,CuCr25 合金的微观组织将变得越来越细。当冷却速度达到 107K/s 时, 可获得纳米结构的微观组织。当冷却速度<103K/s 时, CuCr25 合金的凝固过程为普通凝固过程;如果冷却速度>104K/s, 其凝固过程为液相分解凝固过程。在快速凝固过程中,CuCr25 合金中没有新相形成。但是,Cu 在富 Cr 相中和 Cr 在富 Cu 相中的溶解度有所增加。

The microstructures and solidification processes of CuCr25 alloys are studied under different cooling rates in the present paper. With increasing of the cooling rate, the microstructures of CuCr25 alloys become finer and finer. When the cooling rate is up to 10^7K/s, nano-microstructures can be obtained. When the cooling rate is 〈10^3K/s, the solidification process of CuCr25 alloys belongs to a general solidification process; if the cooling rate is 〉10^4K/s, it belongs to the liquid phase separation process. In rapid solidification process, there is no new phase formed in CuCr25 alloys, but the solubility of Cu in Cr-rich phase and Cr in Cu-rich phase will increase.