Characteristics and Microstructure of a Hypereutectic Al-Si Alloy Powder by Ultrasonic Gas Atomization Process

A hypereutectic Al-Si alloy powder was prepared by ultrasonic gas atomization process. The morphologies, microstructure and phase constituent of the alloy powder were studied. The results showed that powder of the alloy was very fine and its microstructure was mainly consisted of Si crystals plus intermetallic compound A19FeSi3, which were.very fine and uniformly distributed.

气雾化Al-Pb系轴瓦合金

采用气雾化技术，制备了应用于工业化ＲＳＰＭ工艺的高质量ＡｌＰｂ系合金粉末。对雾化粉末显微结构的分析表明，第二相（铅相）在基体中分布均匀，其粒径大小取决于凝固过程的冷速；不同粒径的粉末第二相分布随冷速的增加而分布更均匀、细化。对雾化粉末中各元素分布的分析表明，硅、铜等元素在晶界上有富积现象。

水平连铸复合Al-10%Pb-钢背轴瓦材料的组织研究

采用水平连铸复合的方法,在冷却速度达到80℃/s的条件下,将Al 10%Pb合金熔体直接铸造复合到钢背上获得Al 10%Pb 钢背轴瓦材料。研究结果表明,在Al 10%Pb合金组织中,球状的铅相颗粒分布均匀、平均直径<13μm;Al 10%Pb 钢背轴瓦材料过渡层为舌状组织结构,这种舌状过渡层组织由FeAl、Fe2Al5和FeAl3相组成。