Al-Si-Ge-Zn钎料钎焊6061铝合金接头组织与性能分析

发布时间：2018-01-16 01:32

本文关键词：Al-Si-Ge-Zn钎料钎焊6061铝合金接头组织与性能分析　出处：《焊接学报》2017年09期 　论文类型：期刊论文

【摘要】：采用新型Al-Si-Ge-Zn钎料钎焊6061铝合金,对钎料及钎焊接头的组织和性能进行了分析,并与Al-Si-Zn和Al-Si-Ge钎料进行了对比.结果表明,Al-Si-Ge钎料熔点较低,但高的Ge元素含量促使钎缝中形成粗大的脆性初生Ge Si相,恶化了钎焊接头组织和性能;Al-Si-Zn钎料由于Zn元素含量较高,引起钎缝中Si元素偏析聚集为大片状,严重影响钎焊接头的力学性能;向Al-Si共晶中添加适量的Ge和Zn元素,维持了较低的钎料熔化温度,同时细化了钎料合金的显微组织,脆性初生Ge Si相和片状硅相消失,细小分散的锗,硅固溶体相均匀分布在α-Al基体中.采用Al-Si-Ge-Zn钎料钎焊6061铝合金,钎焊接头抗剪强度最大.
[Abstract]:The microstructure and properties of brazing filler metal and brazing joint were analyzed by using new Al-Si-Ge-Zn brazing filler metal to braze 6061 aluminum alloy. The results show that the melting point of Al-Si-Ge filler metal is lower than that of Al-Si-Zn and Al-Si-Ge solder. However, the high GE content promotes the formation of coarse brittle primary GE Si phase in the brazing seam, which deteriorates the microstructure and properties of the brazed joints. Due to the high content of Zn in the Al-Si-Zn solder, the segregation of Si in the brazing seam becomes a large sheet, which seriously affects the mechanical properties of the brazed joint. Adding some GE and Zn elements to Al-Si eutectic, the melting temperature of brazing alloy was kept low, and the microstructure of brazing alloy was refined, and the brittle primary GE Si phase and flake silicon phase disappeared. The fine dispersed germanium and silicon solid solution phase are uniformly distributed in 伪 -Al matrix. Al-Si-Ge-Zn solder is used to braze 6061 aluminum alloy, and the shear strength of brazed joint is the highest.
【作者单位】：北京科技大学材料科学与工程学院;
【基金】：广东省科技计划资助项目(2010A080402014)
【分类号】：TG407
【正文快照】： 0序言6061铝合金[1-2]作为一种Al-Mg-Si系变形铝合金,比重轻,具有良好的强度及耐腐蚀性,广泛应用于制造汽车管路件及阀件.目前在该类零部件组装生产过程中,主要采用钎焊连接,但由于6061铝合金熔点较低(固相线温度582~595℃),用传统的Al-Si钎料[3]极易出现过烧,所以该类零部件

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