Abstract The hot rolled 7075 aluminum alloy was modified by friction stir processing (FSP) technology, and the effects of different processing parameters on impact toughness and microstructure of machining region were analyzed. The results showed that the impact toughness of machining region was 2.3 times that of the base metal when the rotation velocity was 1200 r/min and the feed rate was 60 mm/min, which much higher than base metal. The fracture morphology was observed by using scanning electron microscope and found that the morphology of fracture dimple was uniform and smooth. The grains in the weld nugget zone were obviously refined after friction stir processing, and the grain refinement effects were not the same in different processing parameters.

中文翻译：

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FSP改性7075铝合金组织及抗冲击性能分析

摘要 采用搅拌摩擦加工(FSP)技术对热轧7075铝合金进行改性，分析了不同加工参数对冲击韧性和加工区显微组织的影响。结果表明，当转速为1200 r/min、进给量为60 mm/min时，加工区的冲击韧性是母材的2.3倍，远高于母材。用扫描电镜观察断口形貌，发现断口形貌均匀、光滑。搅拌摩擦加工后焊缝熔核区晶粒明显细化，不同加工参数的晶粒细化效果不同。