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Experimental investigation of laser irradiation effects on thin aluminum sheets subjected to tangential flow

机译：切向流对铝薄板激光辐照影响的实验研究

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Experiments are performed to investigate the laser irradiation effects on thin aluminum alloy sheets subjected to tangential airflow. The wind blower generated airflow with a speed of about 100 m/s along the surface. For comparison, experiments in the absence of airflow are also conducted. Moreover, in order to know whether the combustion reaction takes place during the irradiation, we vary the composition of flow from air to nitrogen. The displacements of the sheets center are measured to see whether the tangential flow has a mechanical effect. The maximum temperature of the sheet is lower than 550 °C after 2 seconds irradiation with the laser power density of 173W/cm~2. Accordingly, the structural parameters of aluminum alloy do not have distinct change and so do the features of sheets. The temperature curves in the air flow and nitrogen flow keep the same and both lower than that in no flow case. Moreover, the displacements measured in three cases do not have obvious difference. These experiment results indicate that the combustion reaction can hardly happen and the tangential flow only has a cooling effect. The maximum temperature reaches 600 °C when the laser power density rises to 400 W/cm~2. Such a high temperature makes that the elastic modulus of aluminum alloy drops rapidly, which greatly softens the alloy sheets. The plastic distort of irradiated sheets confirmed this process. When the power density rises to 450W/cm~2, a big melt-through phenomenon is observed and there is viscous dripping under gravity in the no-flow case. However, in air flow and nitrogen flow, we can see the removal of macroscopic unmelted pieces of aluminum alloy sheet. The results indicate that the tangential flow mainly has two effects including cooling the target and removing the unmelted metal when the material is fully softened.
机译：进行实验以研究激光辐照在切向气流下对铝合金薄板的影响。鼓风机沿着表面以约100 m / s的速度产生气流。为了进行比较，还进行了没有气流的实验。而且，为了知道在辐照过程中是否发生燃烧反应，我们改变了从空气到氮气的流动组成。测量纸张中心的位移，以查看切向流是否具有机械作用。在以173W / cm〜2的激光功率密度照射2秒后，片材的最高温度低于550℃。因此，铝合金的结构参数没有明显变化，板材的特征也没有明显变化。空气流量和氮气流量中的温度曲线保持不变，并且均低于无流量情况下的温度曲线。而且，在三种情况下测得的位移没有明显差异。这些实验结果表明，燃烧反应几乎不会发生，切向流仅具有冷却作用。当激光功率密度提高到400 W / cm〜2时，最高温度达到600°C。如此高的温度使得铝合金的弹性模量迅速下降，从而极大地软化了合金板。辐照板的塑性变形证实了这一过程。当功率密度上升到450W / cm〜2时，在无流动情况下会观察到较大的熔穿现象，并且在重力作用下会出现粘性滴落。但是，在空气流和氮气流中，我们可以看到宏观的铝合金板未熔化碎片的去除。结果表明，切向流主要具有两种作用，包括冷却靶材和在材料完全软化时除去未熔化的金属。

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