合金元素对6063铝合金阶梯焊中温钎料性能的影响  

Effect of alloying elements on intermediate temperature filler metal in stepped welding of 6063 aluminum alloy

作　　者：朱宏[1,2] 薛松柏[1] 盛重[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]中国电子科技集团第十四研究所,南京210013

出　　处：《焊接学报》2009年第8期33-36,共4页Transactions of The China Welding Institution

基　　金：国家基础研究基金资助项目(B1120060474)

摘　　要：运用正交试验法,通过改变Si,Cu,Ni元素以及混合稀土RE元素的配比,研究含量的变化对Al-Si-Cu-Ni-RE钎料的熔点、铺展性以及抗剪强度的影响,并通过扫描电镜及能谱分析了钎料内部显微组织;通过研究发现,钎料的成分及加热温度是影响铺展面积的主要因素;对钎料显微组织分析可知,钎料中黑色的脆性θ(CuAl2)相和区域偏析的絮状相不利于接头的性能,而具有面心立方固溶体的基体相α(Al)以及球状聚集的Si相,使得钎料的力学性能优良.结果表明,对钎料熔点的影响方面,Cu元素的影响最大,其次为Ni,Si,RE元素,钎料的熔点随着Cu元素含量的增加而急剧下降.The contents of Si,Cu,Ni and RE are changed by using orthogonal test in order to study the effect of the content changes on the melting points,spreading property and shear strength of Al-Si-Cu-Ni-RE,and the microstructure of filler metal is analyzed by SEM and EDS.It is indicated that the spreading area is mainly affected by the composition of filler metal and temperature;the DSC results show that Cu has the most important influence on the melting points filler metal,which decreases sharply with the Cu content increasing,and then Ni,Si and RE come second;the black brittle phase θ(CuAl2)and the macrosegregation flocculent phase go against the performance of joint,but the matrix phase α(Al)with face-centered cubic solid solution and the Si phase with conglobulation make the performance of joint better.

关 键 词：正交试验 铺展性 熔点 显微组织 

分 类 号：TG54[金属学及工艺—金属切削加工及机床]