【摘要】 以Al基钎料对变形镁合金AZ31B进行了高频感应钎焊,研究了变形镁合金AZ31B钎焊接头的钎缝物相和力学性能。采用扫描电镜、X射线衍射仪、X射线能谱分析仪等分析了接头的界面组织及钎缝生成相,测试了接头的抗拉强度及界面生成相的显微硬度。结果表明:钎缝中钎料与母材发生界面反应生成α-Mg,-βMg17(Al,Zn)12相。钎焊搭接接头平均剪切强度为27MPa,对接接头平均抗拉强度为42MPa。对接接头断口的主要断裂形式为沿晶脆性断裂,断裂主要产生在-βMg17(Al,Zn)12硬脆相处。更多还原

【Abstract】 Induction brazing of wrought magnesium alloy AZ31B using Al matrix filler metal was investigated.Both the phases of brazing seam and the mechanical properties of brazed joint were studied.The interface structure and formation phase of brazing seam of the brazed joint were investigated by scanning electron microscopy,X-ray diffraction and X-ray electron probe microanalysis.The tensile strength of joint and the microhardness of the formation phases were also tested.The results show that Al matrix filler metal has reacted with the base metal and α-Mg,β-Mg17(Al,Zn)12 phases have been produced in brazing seam.Average tensile strength of the butted joint reached 42MPa and average shear strength of the overlapped joint reached 27MPa.The joint mainly exhibits intergranular fracture mode and the fracture comes from β-Mg17(Al,Zn)12 hard brittle phase.更多还原