高强韧压铸A356铝合金的熔炼新技术研究  

New Melting Technology of High Strength Die Cast A356 Aluminum Alloy

作　　者：朱超[1] 覃才友 

机构地区：[1]四川工程职业技术学院,四川德阳618000

出　　处：《热加工工艺》2015年第9期82-84,87,共4页Hot Working Technology

摘　　要：针对传统压铸铝合金熔炼工艺中易出现熔体中的气体、杂质含量高等缺陷,无法制备高强韧压铸铝合金熔体。本文提出利用Ar+5%R12氟利昂对A356铝合金熔体进行精炼,对比熔体含氢量发现远比单独通Ar精炼效果要好。然后向经过Ar、Ar+5%R12氟利昂精炼的A356铝合金熔体中加入0.2%的Al-5Ti-1B中间合金进行细化处理,通过金相图以及网格法测晶粒数发现,Ar+5%R12精炼后加Al-5Ti-1B细化得到的组织比Ar精炼加Al-5Ti-1B细化得到的组织更细小均匀,更容易制得高质量的高强韧压铸A356铝合金熔体,为工厂实际生产提供了指导作用。To solve the defects of high content of gas and impurity in traditional die-cast in aluminium alloy melting process which cannot produce high strength and high toughness aluminum alloy,the use of Ar ＋ 5% R12 Freon to A356 alloy melt refining was proposed, and the refining result is much better than using Ar alone compared with hydrogen content of the melt. Then, after Ar ＋ 5% R12 Freon to A356 alloy melt for refining, 0.2% Al-5Ti-1B master alloy adds to A356 aluminium alloy melt to refine the grain. According to phase diagram and grid method for measuring grains, the microstructure after Ar ＋5% R12 refining added Al-5Ti-1B to grain refinement is much better than the microstructure after Ar refining added Al-5Ti-1B to grain refinement. And it is easier to obtain high strength and high quality die-cast A356 aluminium alloy melt.Finally, the result can be used to guide the actual production.

关 键 词：高强韧 熔体精炼 A356铝合金 R12氟利昂 Al-5Ti-1B 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113.2[金属学及工艺—金属材料]