以Zn基钎料对变形镁合金AZ31B进行了高频感应钎焊,研究了钎焊接头的钎缝物相及力学性能.采用扫描电镜、X射线衍射仪、X射线能谱分析仪等分析了钎焊接头的界面组织及钎缝物相,测试了钎焊接头的强度及钎缝组织的显微硬度.结果表明:钎料与母材发生界面反应,在钎缝中生成α-Mg,γ-MgZn相.钎焊搭接接头平均抗剪强度为55 MPa,对接接头平均抗拉强度为77 MPa.接头的主要断裂形式为沿晶脆性断裂,断裂主要产生在α-Mg+γ-MgZn共析体组织处和α-Mg基体与α-Mg+γ-MgZn共析体组织的界面处.
Magnesium alloy AZ31B plates was soldered by means of high-frequency induction soldering using Zn matrix filler metal. The interfacial microstructures and the mechanical properties of the soldered joint were studied. The interfacial microstructures and formation phases of the soldered joint were investigated by scanning electron microscopy, X-ray diffraction and X-ray energy dispersive spectroscopy. The strength of the soldered joint and the microhardness of microstructure of the soldering seam were also tested. The results showed that Zn matrix filler metal reacted with the base metal AZ31B and α-Mg and γ-MgZn phases were formed in the soldering seam region. Average tensile strength of the butted joint was 77 MPa and average shearing strength of the overlapped joint was 55 MPa. The fracture analysis results indicated that fracture surface of the soldered joint mainly exhibited intergranular fracture mode. The crack originated from α-Mg+γ-MgZn eutectoid structure and interface of α-Mg matrix and α-Mg+γ-MgZn eutectoid structure.
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