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采用搅拌摩擦焊对铝镁钪合金热轧板和冷轧-退火板进行焊接。测定焊接接头的硬度分布和拉伸力学性能,采用金相和透射电子显微技术分析焊缝区显微组织特征和力学性能的关系。结果表明,热轧板和冷轧-退火板搅拌摩擦焊焊接系数高达92%;焊接接头上焊核区硬度最低、拉伸断口位于焊核区;焊核区在热循环作用下发生部分再结晶导致的亚结构强化的减弱以及Al3(Sc,Zr)粒子共格强化作用的消失是搅拌摩擦焊焊核区强度下降的主要原因。
Friction stir welding is adopted to weld the hot-rolled aluminum-magnesium-scandium alloy plate and the cold-rolled-annealed plate. The hardness distribution and tensile mechanical properties of the welded joint were measured. The relationship between the microstructure and mechanical properties of the weld zone was analyzed by metallographic and transmission electron microscopy. The results show that the friction coefficient of hot-rolled plate and cold-rolled-annealed plate is as high as 92%, the hardness of weld nugget is the lowest, and the tensile fracture is located in nugget. The weld nugget partially recrystallizes under thermal cycling The weakening of the sub-structure and the disappearance of the co-strengthening effect of the Al3 (Sc, Zr) particles are the main reasons for the decrease of the strength of the nuclear fusion zone.