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采用钕玻璃脉冲激光器进行了室温到300℃区间AZ80-T6镁合金激光冲击温强化(WLSP)实验研究。结果表明:WLSP具有明显的温强化效果,比室温冲击强化(LSP)产生更高幅值的残余压应力,150℃时表面残余压应力(-150 MPa)和显微硬度均达到最大值,此时硬度较基体提高了35.8%,具有最佳的温强化效果;而150℃~250℃区间表面显微硬度趋于稳定值,其范围为122.1~119.1 HV,表现出良好的热稳定性。此外,还对不同温度下冲击凹坑的三维(3D)轮廓、表面形貌和表面粗糙度进行了分析和讨论。
A neodymium glass pulsed laser was used to study the laser shock temperature enhancement (WLSP) experiment of AZ80-T6 magnesium alloy at room temperature to 300 ℃. The results show that WLSP has obvious temperature strengthening effect and produces higher amplitude residual compressive stress than room temperature impact strengthening (LSP). The surface residual compressive stress (-150 MPa) and microhardness reach the maximum at 150 ℃, Hardness was 35.8% higher than that of the matrix, which had the best effect of temperature strengthening. However, the surface microhardness tended to be stable in the range of 150 ℃ ~ 250 ℃, ranging from 122.1 to 119.1 HV, showing good thermal stability. In addition, the three-dimensional (3D) profile, surface topography and surface roughness of impact pits at different temperatures were also analyzed and discussed.