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为了研究激光辐照材料引起表面波纹现象及原因,采用钕玻璃激光器产生的脉冲激光来冲击黑漆作为吸收层的AZ91镁合金试样。激光冲击后采用表面三维轮廓仪对试样冲击区域表面进行测量,结果得到在冲击区域存在波纹分布现象;观测并描绘了表面形貌及表面波纹的分布情况,并分析了材料表面波纹特性与激光能量的关系;得出波纹特性受激光能量影响。最后从等离子体对试样的作用和等离子体内部相干受激光散射机制引起的光栅效应两个方面出发,讨论了热传导、热辐射以及激光照射等因素在试样表面产生热微扰动现象的耦合过程,进而从表面热微扰动的非平衡状态探讨了表面波纹的形成机理。
In order to study the phenomenon of surface ripples caused by laser irradiated materials and the reason, pulsed lasers produced by neodymium glass laser were used to impact black paint as the sample of AZ91 magnesium alloy. After the laser shock, the surface three-dimensional profiler was used to measure the impact area surface of the specimen. The results showed that there was a ripple distribution in the impact area. The surface morphology and surface corrugation distribution were observed and analyzed. The surface corrugation characteristics and laser The relationship between energy; derived ripple characteristics by the laser energy. Finally, the coupling process of thermal perturbation on the sample surface, including heat conduction, thermal radiation and laser irradiation, is discussed based on the effect of the plasma on the sample and the grating effect caused by the laser scattering mechanism in the plasma. , And then from the surface thermal perturbation of the unbalanced state discussed the formation mechanism of surface waviness.