超音速电弧喷射Ag—Cu共晶熔滴的快速凝固  

Rapid solidification of Ag-Cu eutectic droplets by ultrasonic arc spray

作　　者：秦国义[1,2] 蔡洪中[3] 王剑华[4] 赵怀志[3] 陈亮维[3] 

机构地区：[1]昆明理工大学材料与冶金工程学院,云南昆明650093 [2]云南大学先进材料工程研究中心,云南昆明650091 [3]昆明贵金属研究所,云南昆明650106 [4]云南省新材料制备与加工重点实验室,云南昆明650093

出　　处：《功能材料》2007年第A10期4047-4050,共4页Journal of Functional Materials

基　　金：云南省应用基础研究基金资助项目（2003E0082M）

摘　　要：采用超音速电弧喷射雾化制备Ag-40％（原子分数）Cu共晶合金粉末，用X射线衍射、扫描电镜等对其凝固行为进行研究。结果表明：粉末为球形颗粒，粒径分布90％集中在15～60μm之间、平均粒径为35gm；冷却速率在10^5～10^7K／s范围，最大过冷度不小于232K；粉末富Ag相的平均点阵参数为0．401877nm，Cu的平均扩展固溶度为20．15％（原子分数），直径≤50μm时，点阵参数为0．39252nm，Cu的固溶度达到40％（原子分数），凝固组织为单相亚稳固溶体；对快速凝固行为进行了分析讨论。Spherical particles of Ag-40at%Cu eutectic alloy were prepared by ultrasonic arc spray atomization process. The particle size of the alloy powders ranged mainly from 15um to 601μm, the average particle size was about 35μm; The cooling rate of droplets have been obtained from10^5K/s to10^7K/s, The largest undercooling of the droplets were ≥232K; The average lattice parameter of rich-Ag in the alloy powders and the average extended solid solution of Cu in the Ag were 0.401877nm and 20at% respectively. The lattice parameter of rich-Ag and extended solid solution of Cu in the Ag were 0.39252nm and 40at% respectively, while the particle size is ≤50μm, the microstructure of the particles is single phase metastable fcc solid solutions. Rapid solidification behaviours were discussed through the paper.

关 键 词：超音速电弧雾化 快速凝固 Ag-Cu共晶 

分 类 号：TG244.3[金属学及工艺—铸造]