Sr和RE变质对Al-Si铸造合金枝晶α的影响  

Effect of Modification with Sr and RE on Dendrite α of Al-Si casting Alloys

作　　者：刘永刚[1] 张良明[2] 陈光[1] 廖恒成[2] 孙国雄[2] 

机构地区：[1]南京理工大学材料科学与工程系,南京210094 [2]东南大学机械系,南京210096

出　　处：《有色金属》2005年第2期15-19,共5页Nonferrous Metals

基　　金：国家自然科学基金资助项目(59974011)

摘　　要：以热分析法研究Sr、RE变质对ZL101及ZL102合金凝固时共晶温度下降值的影响,从定量金相的角度研究Sr、RE变质对ZL101及ZL102合金枝晶α相析出数量及枝晶α一次、二次枝臂间距的影响。结果表明,随Sr、RE变质元素加入量增加,共晶温度下降值先增加后下降,最后趋向一个稳定值。枝晶α相析出数量受合金种类、变质元素种类及加入量、浇铸条件等多重因素的影响。Sr、RE变质元素均促使Al-Si合金一次枝臂间距减少,二次枝臂间距变得细密。The effects of Sr and RE modification on the eutectic temperature depression of ZL101 and ZL102 are studied by thermal analysis, and the amount of dendrite α, primary dendrite arm spacing and second dendrite spacing are also studied by quantitative analysis. It is concluded that the eutectic temperature depression is increased to a maximum, then decreased to a certain stable value, with the increase of Sr and RE dosage respectively. The amount of dendrite α is affected by the properties of alloys and modified elements, modified elements dosage, and casting conditions, etc. Both Sr and RE can decrease the primary dendrite arm spacing and second dendrite arm spacing.

关 键 词：RE SR 枝晶 铸造合金 ZL102合金 Al-Si合金 ZL101 共晶温度 变质元素 热分析法 合金凝固 定量金相 相析出 二次枝 加入量 稳定值 降值 种类 

分 类 号：TG146.21[一般工业技术—材料科学与工程] S858.305.3[金属学及工艺—金属材料]