( 1. 南通工學(xué)院 機(jī)械工程系， 南通 226007；
2. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院， 上海 200030)
摘 要: 采用一種含有玻璃成分的稀土熔劑，在1080℃高溫條件下，對(duì)Al-10%Pb合金熔體進(jìn)行覆蓋、保護(hù)和凈化。 結(jié)果表明： 同無熔劑相比， 加入量為1.0%和0.5%時(shí)， 合金的抗拉強(qiáng)度分別提高12.8%和12.0%， 延伸率分別提高42.8%和6.5%； 當(dāng)流道厚度為1.0mm時(shí)，合金的流動(dòng)性分別提高27.3%和1.4%。 同1.5%的熔劑加入量相比， 采用1.0%的稀土熔劑處理后的Al-Pb合金組織中鉛粒圓整， 平均直徑僅為20μm左右， 分布比較均勻。 分析了該種熔劑的作用機(jī)理。
關(guān)鍵字: 稀土熔劑； Al-10%Pb合金；變質(zhì)； 化學(xué)凈化
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
