Abstract
Through the theoretical simulation and analysis of the whole process of laser ablating target and producing plasma with high spatio-temporal resolution, it is helpful for people to gain a more complete understanding of the ablation process of target and the evolution process of plasma parameters, which has an important guiding role for the improvement and optimization of laser ablation technology. Alloys are commonly used in daily life, but there are few researches on laser-induced alloy targets at present. Therefore, based on the thermal model of laser ablation and the two-dimensional axisymmetric multi-species hydrodynamic model, the process of laser ablating Al-Mg alloy under atmospheric pressure argon is theoretically simulated, and the ablation process of alloy target and the spatio-temporal evolution results of plasma parameters under different laser irradiances are compared. At high laser irradiance, the melt and evaporation depth, laser energy absorption and plasma characterization parameters are much greater than those at low laser irradiance, and the species energy distribution at different laser irradiance also presents different trends. In addition, the velocity of different species is calculated according to the position-time diagram of the maximum emission intensity, and they expand at a constant speed during the studied time. These results can provide some theoretical guidance for the early application of laser-induced breakdown spectroscopy in metallurgy.
Highlights
The interaction between laser and matter and the resulting plasma have a wide range of application values, for example, laser-induced breakdown spectroscopy (LIBS) is based on the analysis of plasma emission spectra to achieve qualitative and quantitative analysis of material components
0.90 2.7 2.37 0.90 1.5×106 921 (Mg), 934 (Al) 1,363 (Mg), 2,792 (Al) 9.04×103 (Mg), 1.04×104 (Al) 1.16×105 (Mg), 2.55×105 (Al) 7.65 (Mg), 5.99 (Al) resolution can help people to fully understand the ablation process of target and the evolution process of plasma parameters, which may point out the way to improve the completeness of LIBS experimental equipment and the spectral analysis model
Many theoretical simulations of the plasma generated by laser ablation of targets have been carried out in the past, and a relatively simple target composed of single element is usually chosen for the purpose of facilitating the calculation
Summary
The interaction between laser and matter and the resulting plasma have a wide range of application values, for example, laser-induced breakdown spectroscopy (LIBS) is based on the analysis of plasma emission spectra to achieve qualitative and quantitative analysis of material components. Colonna et al used one-dimensional hydrodynamic model to describe the expansion of TiO plasma produced by laser ablation, and analyzed the spatio-temporal evolution of plasma parameters under different input conditions [16]. Gornushkin et al used the radiation dynamic model to simulate the expansion of SiC plasma in vacuum, compared the spatio-temporal evolution of plasma parameters under different initial conditions, and analyzed the changes of Si I and C II emission lines in the range of 280–290 nm [18]. The interaction between laser with different irradiance and binary alloy target in argon gas is theoretically simulated and the species dynamics of various metal elements is analyzed so as to speed up the application of LIBS in process analysis in metallurgy. The forward difference method was used to solve the heat conduction equation, and the explicit Lax-Wendroff combined with the Flux-Corrected Transport method [29] was used to solve the hydrodynamics equations
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