焊管2025，Vol.48Issue(5)：36-44,9.DOI:10.19291/j.cnki.1001-3938.2025.05.005
AZ31B镁合金搅拌摩擦多道焊接头组织和性能研究
Study on Microstructure and Mechanical Properties of Multi-pass Friction Stir Welding AZ31B Magnesium Alloy Joints
摘要
Abstract
In response to the problem of lower properties of friction stir welding(FSW)magnesium alloy joints compared to the base material,the friction stir processing method was adopted to strengthen joint performance.Additionally,the influence of processing passes on themicrostructure and mechanical properties of the joints was analyzed.The results show that well-formed joints can be obtained by FSW.Moreover,the microstructure ismore uniform,and the grains size is finer in the stirring zone with increasing processing passes,which can result in improved mechanical properties.The tensile strength of three-pass FSW samples is the highest,reaching 198 MPa,which is 75.9%of the base material's strength.Additionally,the second-phase particles in the stirring zone are mainly β-Mg17Al12 phase,which are dispersed;furthermore,the grain size is refined from 20.27 μm to 7.95 μm.The fracture mode of FSW joints changes from mixed fracture to ductile fracture,and the fracture location shifts from the weld center to the TMAZ on the advancing side.关键词
搅拌摩擦焊/加工道次/AZ31B镁合金/晶粒尺寸/力学性能Key words
friction stir welding/processing pass/AZ31B magnesium alloy/grain size/mechanical properties分类
金属材料引用本文复制引用
彭倩群,毛育青,王金锴,龙腾飞,罗辉,万龙..AZ31B镁合金搅拌摩擦多道焊接头组织和性能研究[J].焊管,2025,48(5):36-44,9.基金项目
国家自然科学基金"超声/辅助热源协同增强的铝合金厚板搅拌摩擦焊新方法与连接机理研究"(项目编号52164045) （项目编号52164045）
国家自然科学基金"铝/镁厚板搅拌摩擦阻隔焊新方法及复合界面结构调控机理研究"(项目编号52465044) （项目编号52465044）
江西省杰出青年基金"基于'互锁+高熵'界面强化铝/镁异质合金厚板搅拌摩擦焊关键技术研究"(项目编号20224ACB214012). （项目编号20224ACB214012）
