采用新的加工技术搅拌摩擦加工对铸造7075铝合金进行改性加工，探讨了加工工艺对加工区微观组织的影响。由于铸造7075铝合金粗大的晶粒和晶间分布的粗大第二相显著降低材料的塑性变形能力，因而采用通常的工具设计和加工参数很难在加工区得到均匀的微观组织。加工工艺优化试验表明，在同样的工具设计和加工参数下，通过两道次重叠加工可在搅拌区获得细小均匀的等轴晶组织，此外，降低加工工具尺寸并提高旋转速度也明显改善了搅拌区微观组织的均匀性。
A new processing technique - friction stir processing (FSP) - was applied to process cast 7075 aluminum alloy. The effect of processing parameters on the microstructure of the stir zone was investigated. Because the coarse grains and coarse second-phase particles at grain boundaries in cast 7075Al reduced its plastic deformation ability substantially, it was difficult to obtain a uniform microstructure by usual tool designs and processing parameters. By overlapping the FSP passes, the homogeneous and fine equiaxed grains were produced in the stir zone. Furthermore, reducing the tool size and increasing the rotation rate resulted in a significant improvement in the microstructural homogeneity of the stir zone.
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