应用激光冲击强化对纯铜表面进行处理改善其耐磨性能。采用球磨实验分析了激光冲击强化前后的耐磨性能,利用X-射线衍射仪和电子背散射衍射技术对表层的相结构和晶粒形态分布进行了分析,并对耐磨性能提高机理进行了讨论。结果表明,纯铜经激光冲击强化后其比磨损率降低了19.5%,同时由于表面粗糙度增大,使得初期摩擦系数增加,但随着摩擦周数的增加,激光冲击强化作用明显,摩擦系数下降。这是由于激光冲击强化在纯铜中引入大量细化晶粒、孪晶和亚结构,阻碍了位错的运动,增强了变形抗力,从而提高了材料的耐磨性能。

In order to improve the wear resistance of copper, laser shock peening is put forward. The wear performances of copper with and without laser shock peening are measured by the ball milling experiment. The phase structure and grain distribution of the surface layer with and without annealing are tested and analyzed by X- ray diffraction (XRD) and electron back scatter diffraction (EBSD). The mechanism of wear resistance improvement is discussed. The results indicate that after LSP, the specific wearability of copper has reduced by 19.5 percent compared with the sample untreated. Simultaneously, the initial friction coefficient of copper increases with the surface roughness increasing, but with the friction cycle increasing, the coefficient of friction declines obviously. Because of the grains refining, twin and sub-structure which block dislocation motion and increase the deformation resistance, the wear resistance of copper treated by LSP is improved.