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中文摘要：
采用搅拌摩擦加工对变形能力差的铸态7075铝合金进行改性加工,探讨了加工工艺对加工区显微组织的影响.加工工艺优化实验表明,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均匀的细小等轴晶组织;此外,减小加工工具尺寸并提高旋转速度也可明显提高搅拌区显微观组织的均匀性.
英文摘要：
Friction stir processing （FSP） was applied to process the as-cast 7075 aluminum alloy which is not easy to deform and obtain fine microstructure, and the effect of processing parameters on the microstructure of the stir zone was investigated. By optimizing tool design, processing parameters and overlapping the FSP passes, the homogeneous structure with fine equiaxed grains has been obtained 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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