【作者】 秦国义； 蔡洪中； 王剑华； 赵怀志； 陈亮维；

【Author】 QIN Guo-yi~(1,2) CAI Hong-zhong~3 WANG Jian-hua~4 ZHAO Huai-zhi~3 CHEN Liang-wei~3 1.College of Material and Metallurgy Engineering,Kunming University of Science and Technology,Kunming 650093,China; 2.Research Centre of Advanced Material Engineering,Yunnan University,Kunming 650091,China; 3.Kunming Institute of Precious Metals,Kunming 650106,China; 4.Key Lab.of Advanced Materials of Yunnan Province,Kunming 650093,China

【机构】 昆明理工大学材料与冶金工程学院； 昆明贵金属研究所； 云南省新材料制备与加工重点实验室；

【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35μm；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．更多还原

【Abstract】 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 60μm,the average particle size was about 35μm;The cooling rate of droplets have been obtained from 10~5K/s to 10~7K/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.更多还原