Experimental investigation on micro-jetting characteristics of aluminum and tin under intense laser loading
Picosecond laser-driven high-energy X-ray sources with excellent characteristics of micro-focus,high brightness and high resolution,have become one of the popular diagnostic methods for studying micro-crack and micro-jetting phenomena of metal materials.Tin has become the preferred material for ejection research on the melting effect because of its low melting point,and aluminum is relatively high due to its relatively high melting point,which is not easy to impact or unload melting to form droplet injection,so the results of aluminum micro-jetting experimental re-search are relatively few.Based on the nanosecond loading source and picosecond beam diagnostic source of the XGⅢlaser device,the influence of surface geometric defect configuration on the metal micro-injection process was studied,and high-resolution physical images of two typical metal micro-injection processes were obtained through delay con-trol,and important information such as morphological distribution,average velocity and areal density distribution of the ejected substances was obtained.The SPH method was used to simulate the experimental results,and the formation mechanism of the ejecta in the experiment and the source of the high-speed ejected material were revealed.
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