Zn-Ag-Cu钎料超声钎焊AZ31B镁合金/6063铝合金

Ultrasonic brazing technology researching of magnesium alloy AZ31B/Aluminum alloy 6063 using Zn-Ag-Cu filler metal

以Zn-Ag-Cu合金作为钎料,使用Ar气氛保护高频感应加热,并在钎焊过程中施加超声震动辅助,在不使用钎剂的情况下获得镁合金AZ31B与铝合金6063的钎焊接头。使用SEM、EDS、XRD分析钎焊接头的微观结构,并测试了接头的力学性能以及焊缝内各物相的显微硬度。研究表明焊缝内物相组成为Mg-Zn共晶、Zn-Al共晶、颗粒状Al(Zn)或Zn(Al)固溶体以及脆性化合物Al6CuMg4+Cu5Zn8。搭接接头平均剪切强度在50 MPa以上。接头以脆性沿晶断裂为主穿晶断裂为辅。断裂位置位于靠近镁母材与焊缝界面扩散层附近的脆性金属间化合物处。

Utilizing Zn-Ag-Cu alloy as the brazing filler metal,high-frequency induction as the heat source,and ultrasonic vibration as the support measure in actual operation,brazing joint between magnesium alloy AZ31 B and aluminum alloy 6063 may be obtained in Ar atmosphere.On this basis,SEM,EDS,and XRD are employed to analyze the microstructure and to test the mechanical property of such brazing joint. This study shows that,phase composition of the brazing seam includes eutectic structure Mg-Zn and Zn-Al,gr anulated ηZn＋αAl and brittle intermetallic compound phase Al6 Cu Mg4＋Cu5Zn8. The average shearing strength of joint is above 50 MPa,and the maximum is 52.14 MPa,with main fracture mechanism of brittle inter-granular fracture,which is located at the IMC zone.