This manuscript reports a novel process of high-temperature laser shock peening (HTLSP) for surface strengthening of single-crystal ceramics such as sapphire and reveals its fundamental mechanisms. HTLSP at 1200°C can induce a high compressive residual stress on the surface of sapphire while minimize the damage of laser-driven shock waves. Transmission electron microscopy characterizations revealed high dislocation densities near the surface, suggesting that plastic deformation at an ultrahigh strain rate was generated by the high shock wave pressure. The HTLSP-induced compressive residual stress can significantly improve the hardness and fracture toughness of sapphire, while maintain its outstanding optical transmittance.

该手稿报告了一种高温激光冲击喷丸（HTLSP）的新工艺，用于对蓝宝石等单晶陶瓷进行表面强化，并揭示了其基本机理。1200°C时的HTLSP可以在蓝宝石表面上产生较高的压缩残余应力，同时将激光驱动的冲击波的损坏降至最低。透射电子显微镜的表征表明，在表面附近有高位错密度，这表明高冲击波压力会产生超高应变速率下的塑性变形。HTLSP引起的压缩残余应力可以显着提高蓝宝石的硬度和断裂韧性，同时保持其出色的透光率。