Improving room-temperature fretting wear performance of brittle TiAl alloy via laser shock peening without coating

To mitigate fretting wear damage in critical high-temperature moving components of aero-engines, such as turbine blades and disks, this study employed LSPwC to treat the surface of TiAl alloys and systematically analyzed their fretting wear behavior and damage mechanisms. The experimental results show that the wear depth of the LSPwCed samples decreased by 43.8% compared to the original samples, while the wear volume increased by 60.4%. After removing the surface remelted layer induced by LSPwC, the wear depth and wear volume decreased by 21.9% and 8.6%, respectively, compared to the original samples. The TiO₂/Al₂O₃ ratio and structural defects such as microcracks and fusion holes in the surface remelted layer formed by LSPwC are the main reasons for the differences in the results. The increase in microhardness induced by LSPwC significantly enhances the overall wear resistance of the material.