【摘要】 采用超音速电弧喷射雾化制备了Cu-10Ag合金粉末,并用SEM和X-射线衍射等对合金液滴的凝固行为进行了研究;对凝固机制进行了分析。结果表明,粉末为球形颗粒,粒径分布主要集中在15～70μm之间,平均直径为45μm;液滴初始冷却速率为105～107K/s;凝固组织是由约含7%的Ag的富Cu晶胞和约含50%～60%的Ag的晶胞壁构成的胞状晶组织,随粉末颗粒直径由80μm减小到15μm,晶胞平均尺寸由约2μm减小为约1μm。更多还原

【Abstract】 Rapidly solidified behavior of Cu-10Ag alloy droplets prepared by ultrasonic arc spray atomization was observed by SEM and X-ray.The powder consists of spheroidal particle with size in the range of from 15 to 70 μm and average size of 45μm.The initial cooling rate of alloy droplets can be realized from 105 K/s to 107 K/s.The solidification structure of alloy droplets is composed of Cu-rich cell containing about 7% Ag and cell wall containing 50%~60% Ag,exhibiting cellular structure.In addition,the average cell size is decreased from about 2 μm to about 1 μm with the particle size decreasing from 80 μm to 15 μm.The solidification mechanism was analyzed also.更多还原