( 1. 南通工学院 机械工程系， 南通 226007；
2. 上海交通大学 材料科学与工程学院， 上海 200030)
摘 要: 采用一种含有玻璃成分的稀土熔剂，在1080℃高温条件下，对Al-10%Pb合金熔体进行覆盖、保护和净化。 结果表明： 同无熔剂相比， 加入量为1.0%和0.5%时， 合金的抗拉强度分别提高12.8%和12.0%， 延伸率分别提高42.8%和6.5%； 当流道厚度为1.0mm时，合金的流动性分别提高27.3%和1.4%。 同1.5%的熔剂加入量相比， 采用1.0%的稀土熔剂处理后的Al-Pb合金组织中铅粒圆整， 平均直径仅为20μm左右， 分布比较均匀。 分析了该种熔剂的作用机理。
关键字: 稀土熔剂； Al-10%Pb合金；变质； 化学净化
properties of Al-10%Pb alloy melt
（ 1. Department of Mechanical Engineering,
Nantong Institute of Technology,
Nantong 226007, China;
2. College of Materials Science and Engineering,
Shanghai Jiaotong University, Shanghai 200030, China）
Abstract: Al-10%Pb alloy melt was covered, protected and purified with rare earth flux contained a glass composition at 1080℃. The experimental results indicate that the tensile strength of the alloy covered with 1.0% and 0.5% rare earth flux increases by 42.8% and 6.5% respectively, while the fluidity increases by 27.3% and 1.4% respectively when the thickness of runner way is 1.0mm comparing with that covered with no flux. The Pb phases in the microstructure of Al-10%Pb alloy are dispersion and roundness with 1.0% rare earth flux . Then the average size is about 20μm. The mechanism of rare earth flux improving the properties and microstructure was also discussed.
Key words: rare earth flux; Al-10%Pb alloy; modification; chemical purifying
