(1. 浙江大学 测试分析中心西溪分中心， 杭州 310028；
2. 浙江大学 材料系， 杭州 310027)
摘 要: 利用透射电子显微镜(TEM)和X射线多晶衍射仪(XRD)观察分析了机械合金化(MA)和熔炼两种方法制备的Cu-15Ni-8Sn(质量分数，%)合金在400℃不同时效时间Spinodal分解产生的调幅组织结构和边带卫星峰，及合金固溶体的晶格参数变化。同时用维氏硬度计测量了合金的时效硬度变化。结果表明，与熔炼法相比， MA制备的该合金时效过程中，Spinodal分解初期的调幅组织结构波长较大，调幅分解速度也慢慢，延缓了γ′相的析出，但时效过程中二者硬度达到峰值的时间几乎是一致的。
关键字: Cu-15Ni-8Sn合金； Spinodal分解； 机械合金化
prepared by mechanical alloying and casting
（1. Center of Test & Analysis, Zhejiang University,
Xixi Campus, Hangzhou 310028, P.R.China;
2. Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027， P.R.China）
Abstract: Spinodal modulation structures, the satellite peaks and the change of lattice parameter of Cu-15Ni-8Sn alloys prepared by mechanical alloying and casting were investigated by means of TEM and XRD, during ageing at 400℃.The hardness was measured before and after the ageing treatment. As the results demonstrated, the size of modulation structures of the alloy prepared by mechanical alloying was smaller at early ageing time, the speed of the Spinodal modulation decomposition was slower and the γ′phase formation was retarded, than that prepared by casting, but their maximum hardness resulted nearly at the same ageing time.
Key words: Cu-15Ni-8Sn alloy; Spinodal decomposition; mechanical alloying
