(浙江大学材料科学与工程系，杭州 310027)
摘 要: 通过X射线衍射仪、透射电镜、扫描电镜分析了Cu-15Ni-8Sn三元合金的机械合金化过程中晶粒尺寸、形貌和微结构变化，以及相的演变。随着球磨时间的增加，α-Cu晶粒尺寸减少，点阵参数与应变量增大。球磨过程中粉末颗粒形貌变化过程与二元系合金相似。发现了球磨3 h有η-Cu6Sn5亚稳相出现，随后该相无序化，最终形成了纳米晶超饱和Cu(Ni,Sn)固溶体。
关键字: 机械合金化 Cu-15Ni-8Sn合金 η-Cu6Sn5相 超饱和Cu(Ni,Sn)固溶体
（Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China）
Abstract:The changes in grain size, morphology and microstrcture, as well as the phase evolution of Cu-15Ni-8Sn (%) element powder during mechanical alloying were investigated by XRD, TEM and SEM. The grain size decreases, but the lattice parameter and the strain increase with the ball milling time increasing. The evolution of the powder particle morphology is similar to that of binary alloys during mechanical alloying. It was also found that a η-Cu6Sn5 phase appeared after milling for about 3 h, then it was disorder. Finally, a nanocrystalline supersaturated Cu(Ni, Sn)solid solution was formed.
Key words: mechanical alloying; Cu-15Ni-8Sn alloy; η-Cu6Sn5 phase; supersaturated Cu(Ni, Sn) solid solution
