机械合金化程度对Cu-15Ni-8Sn合金性能的影响

通过机械合金化 (MA)制备出未合金化 (均匀混合 )、部分合金化和完全合金化 3种Cu 15Ni 8Sn(质量分数 ,% )粉末 ,经粉末冶金工艺成型。利用X射线衍射仪 (XRD)和扫描电镜 (SEM)分析了 3种粉末的晶粒尺寸、畸变能、晶格参数和颗粒大小 ,测试了合金时效前后的硬度 ,研究了机械合金化程度对该材料成型性能及其Spin odal调幅分解的影响。结果表明 ,在压制和烧结性能方面 ,未合金化粉末最好 ,完全合金化粉末稍好于部分合金化粉末 ;通过轧制能有效地提高部分和完全合金化粉末制成合金的密度 ;冷形变时效后完全合金化粉末制成的合金具有最大峰值硬度 ,且过时效时间延长。

Influence of mechanical alloying on properties of Cu-15Ni-8Sn alloy

Blend, partially prealloyed and completely prealloyed Cu 15Ni 8Sn powders have been prepared by mechanical alloying, respectively, and then consolidated using conventional powder metallurgy method. The grain sizes, strain, crystalline parameter and particle sizes of the three kinds of powders were analyzed by XRD and SEM. The hardness was measured before and after the ageing treatment. The influence on the consolidated properties and the SPINODAL modulation decomposition were studied. The results indicate that the blend powders is the best, completely alloyed powders is slight better than that of partially prealloyed powders, for the properties of the press and sintering. The consolidated density of the partially and the completely prealloyed powders can be effectively improved by rolling. The alloy that made of completely prealloyed powders has highest hardness, and its over ageing time has been delayed, in the cold worked ageing.