Zhu Wenlong, Liu Huabing, Xing Shilong, Jiang Chuanhai, Ji Vincent
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Green & Smart River-Sea-Going Ship, Cruise and Yacht Research Center, Wuhan University of Technology, Wuhan 430062, China.
Materials (Basel). 2024 Oct 17;17(20):5066. doi: 10.3390/ma17205066.
This work systematically investigated the effect of dual shot peening (DSP) and conventional shot peening (CSP) on the microstructure, residual stress and wear performance of the CNT/Al-Cu-Mg composites. The results indicated that compared with CSP, DSP effectively reduced surface roughness (Rz) from 31.30 to 12.04 μm. In parallel, DSP introduced a smaller domain size (33.1 nm) and more dislocations, higher levels compressive residual stress and a stiffer deformation layer with deeper affected zones. Moreover, DSP effectively improved the uniformity of the surface layer's microstructure and residual stress distribution. The improvement is mainly due to secondary impact deformation by microshots and fine grain strengthening. In addition, the transformation of the hard second phases such as AlC and CNT and its effects on improving the surface strength and deformation uniformity were discussed. Significantly, DSP improved the wear resistance by 31.8% under the load of 6 N, which is attributed to the synergistic influence of factors including hardness, compressive residual stress, surface roughness, and grain size. In summary, it can be concluded that DSP is an effective strategy to promote the surface layer characteristics for CNT/Al-Cu-Mg composites.
本工作系统研究了双喷丸处理（DSP）和传统喷丸处理（CSP）对碳纳米管/铝 - 铜 - 镁复合材料微观结构、残余应力和磨损性能的影响。结果表明，与CSP相比，DSP有效地将表面粗糙度（Rz）从31.30μm降低至12.04μm。同时，DSP引入了更小的畴尺寸（33.1nm）和更多的位错、更高水平的压缩残余应力以及具有更深影响区域的更硬变形层。此外，DSP有效地改善了表面层微观结构和残余应力分布的均匀性。这种改善主要归因于微丸的二次冲击变形和细晶强化。此外，还讨论了诸如AlC和碳纳米管等硬质第二相的转变及其对提高表面强度和变形均匀性的影响。值得注意的是，在6N载荷下，DSP使耐磨性提高了31.8%，这归因于硬度、压缩残余应力、表面粗糙度和晶粒尺寸等因素的协同影响。总之，可以得出结论，DSP是促进碳纳米管/铝 - 铜 - 镁复合材料表面层特性的有效策略。
