In this study, the surface of friction stir surface processing (FSSP)-modified copper alloy was altered by different passes of modification and lower pressure after selecting FSSP process parameters. The results showed that the grain size of the modified copper alloy surface was refined under various processes. In the modified section, the grains changed from fine equiaxed grains to rolling strips from the surface layer to the bottom of copper alloy sheet. FSSP could change the surface metallographic organization but could not change the internal structure of the sheet. The hardness values of samples obtained under various processes were higher than those of base metal, but the hardness of modified boundary region was slightly lower than that of base metal. The tensile strength of samples obtained under various processes was higher than that of base metal. Among them, FSSP was the best after one pass of modification, followed by two passes, and the worst was three passes. Most of the stretches appeared on the advancing side, and only a few appeared on the retreating side. The tensile parts had a honeycomb-type morphology, with a ductile fracture mode.

在这项研究中，在选择FSSP工艺参数后，通过不同的修整次数和较低的压力来改变搅拌摩擦表面处理（FSSP）改性铜合金的表面。结果表明，在不同工艺条件下，改性铜合金表面的晶粒尺寸均得到细化。在变形部分中，晶粒从细等轴晶粒变为从铜合金薄板的表层到底部的轧制带。FSSP可以改变表面金相组织，但不能改变板的内部结构。在各种方法下获得的样品的硬度值均高于母材，但改性边界区的硬度略低于母材。在各种方法下获得的样品的抗拉强度均高于贱金属。其中，FSSP经过一轮修改之后是最好的，其次是两轮修改，最差的是三轮修改。大部分伸展出现在前进的一侧，只有少数出现在后退的一侧。拉伸部分具有蜂窝状形态，具有韧性断裂模式。