【摘要】 研究了机械合金化诱发AgCu20Ni2过饱和合金粉末的形成及粉末冶金方法制备AgCu20Ni2合金的过程,对获得的AgCu20Ni2合金的组织和物理性能关系进行了分析,探讨了制备工艺和冷压变形对合金综合性能的影响。结果表明:采用高能球磨30 h,可获得纳米晶的过饱和合金粉末;合金粉末制备的AgCu20Ni2合金由富Ag的基体α相和均匀分布的析出β相构成,析出相界面结构能有效阻碍基体中位错的运动,强化效果明显。合金断口的SEM、EDS分析表明,AgCu20Ni2合金的断裂类型为韧性断裂。更多还原

【Abstract】 AgCu20Ni2 supersaturated alloy powders were prepared by mechanical alloying and AgCu20Ni2 alloy was fabricated by method of powder metallurgy using the powders.Microstructure,physical properties of the AgCu20Ni2 alloy was examined,and the effect of sintering process and cold deformation on properties of the alloy was also discussed.The results show that the nanocrystalline AgCu20Ni2 alloy powders are obtained after high energy milling for 30 h.The microstructure of AgCu20Ni2 alloy consists of Ag-rich-α matrix and precipitates β phase which disperse uniformly in the matrix strengthening the alloy.SEM observation and EDS analysis of fracture surface show that the AgCu20Ni2 alloy exhibits ductile fracture features under bending loading.更多还原