中文摘要：

通过X射线、扫描电镜、显微硬度仪和摩擦磨损试验机等对7A52铝合金焊接接头高能喷丸处理前后的表面微观组织、晶粒尺寸、变形层厚度、显微硬度和耐磨性进行了测试分析.结果表明,经过20 min高能喷丸处理以后,母材、焊缝以及热影响区的表面平均晶粒尺寸分别为28.2,24.7和34.4 nm;表面变形层厚度约为36.5μm;材料焊接接头各个区域的表面硬度有所提高,焊接接头磨损率为0.005 6%,是高能喷丸前焊接接头磨损率的29.9%.

英文摘要：

The surface layer of the welded joint of 7A52 aluminum alloy was treated by high-energy shot peening（HESP） technique,the microstructure,grain size,deformation layer thickness,microhardness and wear resistance were analyzed after surface nanocrystallization.The results showed that after 20 min high-energy shot peening,the surface of the average grain sizes of the base material,welded and heat affected zone were 28.2 nm,24.7 nm and 34.4 nm,deformed layer thickness of surface was about 36.5 μm,after the high-energy shot peening,surface hardness were improved,the wear rate of welded joint was 0.005 6% after surface nanocrystallization,which was 29.9% wear rate of welded joint before surface nanocrystallization.