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利用电子背散射衍射技术(EBSD),研究7085-T7452铝合金双面搅拌摩擦焊缝组织演变规律。结果表明:相对于7085-T7452铝合金母材,双面搅拌摩擦焊缝的晶粒发生明显细化,焊缝的大角度晶界体积分数在300 r/min的旋转速度时较高(75%以上),随着旋转速度升高到950 r/min而降低。热-机影响区被拉长晶粒和热影响区部分等轴粗大晶粒的平均尺寸分别是7.3和15.7μm,且大角度晶界体积分数分别为43%和30%。与母材相比,双面搅拌摩擦焊缝焊核区(100)、(110)和(111)极图的强度降低,且沿板厚方向存在较大的差异。
Electron backscatter diffraction (EBSD) was used to study the microstructure evolution of 7085-T7452 aluminum alloy double-side friction stir welded seam. The results show that the grain size of the double-side friction stir weld is obviously refined compared with that of the 7085-T7452 aluminum alloy. The large-angle grain boundary volume fraction of the weld is higher at the rotating speed of 300 r / min (75% Above), decreasing as the rotational speed increases to 950 r / min. The average size of coarse equiaxed grains in the heat-machine affected zone and the part of the heat affected zone are 7.3 and 15.7 μm, respectively, and the large-angle grain boundaries have volume fractions of 43% and 30%, respectively. Compared with the base metal, the strength of the (100), (110) and (111) pole figures in the two-side friction stir weld decreases, and there is a big difference along the thickness direction.