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为了连接变形镁合金AZ31B,以Al基钎料对变形镁合金AZ31B进行高频感应钎焊。采用扫描电镜、X射线衍射仪、X射线能谱等分析钎焊接头的显微组织及钎缝物相,测试钎焊接头的力学性能及显微硬度。结果表明:在钎焊过程中熔融的Al基钎料与固态的AZ31B母材发生强烈的合金化作用,原始钎料中均一的Mg32(Al,Zn)49相在钎焊后完全消失,同时在钎缝中生成α-Mg、β-Mg17(Al,Zn)12相。钎焊搭接接头的平均抗剪强度达到44MPa,对接接头的平均抗拉强度达到71MPa。接头的断裂形式为沿晶脆性断裂,断裂产生在β-Mg17(Al,Zn)12硬脆相处。
In order to connect the deformation of magnesium alloy AZ31B, Al-based brazing alloy AZ31B deformation of high-frequency induction brazing. The microstructure and braze phase of brazed joints were analyzed by scanning electron microscopy, X-ray diffraction and X-ray energy dispersive spectroscopy. The mechanical properties and microhardness of brazed joints were tested. The results show that the Al-based brazing filler metal melts strongly with the solid AZ31B base metal during brazing. The homogenous Mg32 (Al, Zn) 49 phase in the original brazing filler completely disappears after brazing. At the same time, The brazing seam produces α-Mg, β-Mg17 (Al, Zn) 12 phases. The average shear strength of the brazed lap joint reached 44MPa, but the average tensile strength of the butted joint reached 71MPa. The fracture form of the joint is brittle fracture along the crystal, and the fracture occurs at the hard and brittle phase of β-Mg17 (Al, Zn) 12.