复合孕育剂Ti、Zr对2519铝铜合金焊缝组织及性能的影响  

Effect of Inoculants Ti and Zr on Microstructure and Mechanical Properties of 2519 Al-Cu Alloy Welds

作　　者：杨成刚[1] 国旭明[2] 刘鸽平[1] 

机构地区：[1]南昌航空大学,江西南昌330063 [2]沈阳航空工业学院,辽宁沈阳110034

出　　处：《稀有金属材料与工程》2010年第A01期400-404,共5页Rare Metal Materials and Engineering

基　　金：国家"863"项目(2002AA305402)

摘　　要：采用3种焊丝对2519铝铜合金进行MIG焊,研究了孕育剂Ti、Zr对焊缝组织和性能的影响。结果表明:Ti和Zr的细化作用是相容的,当焊丝中单独添加孕育剂Ti或Zr时,焊缝几乎由粗大的柱状晶组成;焊丝中复合添加少量的孕育剂Ti和Zr时,Ti和Zr在熔池中分别形成Al3Ti和Al3Zr,促进了α(Al)非均质形核;随着焊丝中Ti和Zr含量的增加,焊缝组织逐步细化,当焊丝中Ti和Zr含量较高时,Ti和Zr还在熔池中形成大量的Al3(Ti,Zr)质点,促进α(Al)非均质形核;焊缝组织由细小均匀的等轴晶组成,显著提高了接头强度和塑性。Metal inert gas （MIG） welding was used to weld 2519 Al-Cu alloy with three filler metal; effect of the inoculants Ti and Zr additions in filler wires on the mierostructures and properties of weld metal was investigated. The results show that Ti and Zr was compatible; grain structure of weld were coarse columnar grains with a little Ti or Zr in filler wires; Al3Ti and Al3Zr were formed in the welding pool with additions of a little Ti and Zr in filler wires, which provided respectively the heterogeneous nucleation sites for a（Al） The grain refinement of the microstructure of weld metal was finer with the increasing of the Ti and Zr contents in filler wires Intermetallic aluminized dispersions Al3 （Ti,Zr） were formed in weld metal with additions of large amounts of Ti and Zr in filler wires, which accelerated the heterogeneous nucleation of a（Al） and resulted in refining grains of the weld metal, so the tensile strength and elongation of weld joint were increased

关 键 词：孕育剂 2519Al-Cu合金 非均质形核 等轴晶 

分 类 号：TG444.74[金属学及工艺—焊接]