Al-Cu-Si-Mg钎料的制备及性能研究  

Preparation and Properties Investigation of Al-Cu-Si-Mg Brazing Filler Metals

作　　者：张波[1] 骆文强[1] 张相召 刘桂武[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《热加工工艺》2017年第1期74-76,80,共4页Hot Working Technology

基　　金：江苏省"六大人才高峰"计划项目(2014-XL-002);江苏省自然学科基金项目(BK20151340);中国博士后基金项目(2014M551512)

摘　　要：在盐浴保护的电阻炉中制备了不同Mg含量的Al-Cu-Si-Mg钎料,并对钎料的显微组织、物相、熔化特性、耐腐蚀性以及拉伸强度进行了测试分析。研究结果表明,Mg能够与Al形成低熔点共晶,从而降低Al-Cu-Si钎料的熔点。钎料中的Mg主要以Mg_2Si的形式存在,Mg能提高钎料的强度是因为Mg_2Si作为硬质相分布于晶界处,增大了拉伸变形过程中的阻力。Mg_2Si具有良好的固溶强化效果,固溶处理后钎料的最高强度达到了308.6 MPa。由于Mg_2Si的溶解速度比氧化膜的形成更快,所以Mg含量越多生成的氧化膜越薄,因此随着Mg含量的增加,钎料的耐腐蚀性降低。A1-Cu-Si-Mg filler metals with different Mg contents were prepared in resistance furnace protected with salt bath. The microstmcture, phase composition, melting characteristics, corrosion resistance and tensile strength of the filler metals were tested and analyzed, The experimental results show that Mg can form low melting-point eutectic with A1 so as to reduce the melting point of A1-Cu-Si brazing filler metals. The Mg mainly exists in the form of Mg：Si in the filler metals. The MgaSi is distributed along the grain boundary as hard phase, which increases the resistance in the process of tensile deformation. Mg：Si has good solid solution strengthening effect, and the tensile strength of the filler metal reaches the maximum of 308.6 MPa after solid solution treatment. Since the dissolution rate of Mg2Si is faster than the formation rate of oxidation film, the bigger the Mg conteni is, the thinner the oxide film is. Therefore, the corrosion resistance of the filler metals decreases with the increase of the Mg content.

关 键 词：铝基钎料 显微组织 拉伸强度 耐腐蚀性 

分 类 号：TG425.2[金属学及工艺—焊接]