电磁搅拌对2219Al-Cu合金焊缝组织及力学性能的影响  

EFFECT OF ELECTROMAGNETICAL STIRRING ON THE STRUCTURE AND MECHANICAL PROPERTIES OF WELD METAL OF 2219A1-Cu ALLOY

作　　者：杨成刚[1] 国旭明[1] 洪张飞[1] 钱百年[1] 

机构地区：[1]中国科学院金属研究所,沈阳110016

出　　处：《金属学报》2005年第10期1077-1081,共5页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划资助项目 2002AA305402

摘　　要：2219Al-Cu合金进行脉冲MIG焊时,加入电磁搅拌可降低焊缝处固-液界面前沿液相的温度梯度,增加非均质形核率,促使粗大、方向性很强的柱状晶转变为细小的等轴晶;沿晶界和枝晶间分布的α(Al)-CuAl_2共晶均匀化;提高了焊缝中Cu元素分布均匀性,形成高密度的GP区,促进θ′相非均质形核.电磁搅拌使接头抗拉强度由296.4MPa增加到326.0MPa,接头系数由63%上升到70%,延伸率由4.7%增加到7.6%.Effects of electromagnetical stirring on the structure and mechanical properties of pulse metal inert gas （MIG） weld metal for 22l9 Al-Cu alloy were investigated. The results show that electromagnetical stirring decreases the thermal gradient at the solid-liquid interface in the weld pool and enhances the density of heterogeneous nucleation, results in the coarse and oriented columnar grains transforming into fine equiaxed grains; improves the morphology and distribution of α（Al）-CuAl2 eutectic along grain boundaries; homogenizes Cu element and enhances the density of GP zone in weld metal, which accelerates the heterogeneous nucleation of θ′ precipitates. Elctromagnetical stirring makes the ultimate tensile strength of weld joint enhance from 296.4 MPa to 326.0 MPa, the joint strength coefficient from 63% to 70% and ductibilitv from 4.7% to 7.6%.

关 键 词：电磁搅拌 焊缝 α(Al)-CuAl2共晶 

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