研究了AA6061-T6和AZ31合金异种搅拌摩擦焊接头的微观组织。在异种搅拌摩擦焊接AA6061-T6与AZ31合金时,采用偏置条件,即将搅拌针插入时偏向AZ31合金,从而得到异种对接接头。通过预备实验来优化搅拌针的前进速度、旋转速度。运用电子背散射衍射技术观察搅拌区的纹理,并得到粒径分布和错位角分布,在搅拌区存在相对精细的晶粒结构。在AA6061-T6搅拌区出现随机或弱面取向,而在AZ31搅拌区出现旋转底面取向。再结晶颗粒的平均尺寸只有2.5~4.5μm。与基础合金相比,在AA6061-T6搅拌区的大角度晶界的分数增大,而在AZ31搅拌区的小角度晶界的分数降低。 The microstructure of AA6061-T6 and AZ31 alloy dissimilar friction stir welded joints was studied. In the dissimilar friction stir welding AA6061-T6 and AZ31 alloy, the use of bias conditions, the pin will be inserted into the deflection AZ31 alloy, resulting in heterogeneous butt joints. Through preparatory experiments to optimize the needle forward speed, rotation speed. The electron backscatter diffraction technique was used to observe the texture of the stirring zone. The particle size distribution and dislocation angle distribution were observed. There was a relatively fine grain structure in the mixing zone. A random or weak face orientation appears in the AA6061-T6 Stirring Zone while the Rotation Bottom Orientation appears in the Stirring Zone AZ31. The average size of the recrystallized grains is only 2.5-4.5 μm. In the AA6061-T6 stirred zone, the fraction of large-angle grain boundaries increases compared with the base alloy, whereas the fraction of small-angle grain boundaries in the stirring zone of AZ31 decreases.