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.
The hot rolled and cold rolled-annealed plates of AI-Mg-Sc alloys were welded by friction stir welding. The hardness dis-tribution and the tensile properties of welded joints were measured; the relationships between the microstrueture and the properties of the welded joints were studied by means of optical microscopy and transmission electron microscopy. The results show that the welding coefficients of two plates are as high as 92%, the hardness and strength of their weld nugget zones are the lowest, and the fracture of their welded joints happens at weld nugget zones during tensile testing. The decrease of the substructure strengthening caused by the partial recrystallizatinn and the loss of precipitation strengthening from Al3(Sc,Zr)particles result in the decline of hardness and strength of Al-Mg-Sc alloy welded joints.
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