稀土熔剂对A356铝合金的作用  

Effect of new flux including rare earth on A356 alloy

作　　者：倪红军[1] 孙宝德[1] 蒋海燕[1] 丁文江[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030

出　　处：《中国有色金属学报》2001年第4期547-552,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展规划项目 (G19990 64 90 0 )

摘　　要：研究了一种含有稀土化合物的铝合金新型熔剂JDN I。结果表明 ,该熔剂通过发生一系列的物理和化学反应 ,不仅可使A3 5 6合金熔体 72 0℃时的含氢量由大于 0 .3 0mL/ 10 0 g(Al)下降到 0 .10mL/ 10 0g(Al)以下 ,除气效果显著 ,并使A3 5 6合金的室温抗拉强度提高 7.2 7% ,延伸率提高 85 .5 8%。该熔剂还具有细化晶粒和变质的作用 ,分析了该熔剂发生作用的机理 。A new flux-JDN I including rare earth compounds for aluminium and its alloys was introduced. With complex physical and chemical effect, function of degassing, drossing, covering, refining and modification was excellent. The hydrogen content could be decreased greatly with JDN I in A356 aluminium melt from >0.30?mL/100?g(Al) to <0.10?mL/100?g(Al), σ b be increased by 7.27% and δ be increased by 85.5%. At the meantime, with JDN I the mechanical properties of A356 could be increased. The mechanism of JDN I improving properties and microstructure was discussed. The concepts of effective rare earth quantity and critically effective rare earth quantity were proposed also.

关 键 词：铝合金 稀土熔剂 除氢 除杂 有效稀土量 临界有效稀土量 铝熔体 熔炼 铸造 

分 类 号：TG292[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]