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Abstract <p>The rapid development of femtosecond lasers facilitates the widespread use of laser technologies to solve many practical problems in such areas of material science as the development of new materials, high-precision micromachining of metals, including the process of homogeneous melting, and a number of other applications. One of the most complex physical problems has turned out to be femtosecond laser ablation, the mechanisms of which are being studied with great effort. Material research at high heating rates requires the development of new methods that are capable of tracking dynamic processes in materials with extreme spatio-temporal resolution. In this paper, a relatively simple mathematical model of the microlevel is developed to study fast interrelated processes in an overheated metastable crystal, in which a significant role belongs to the generation of structural defects. When structural defects reach certain conditions that lead to the appearance of stable nuclei of the liquid phase, the process of homogeneous melting occurs in the crystal. The determination of the main function, which is a function of the degree of crystal overheating, as well as the values of the parameters included in the proposed model, is carried out by molecular dynamics modeling of the process of homogeneous melting of a single crystal of aluminum. Using the constructed mathematical model, various crystal heating modes were investigated: with a low rate <i>k</i> &lt; 100 K/ps and high values of the rate <i>k</i> &gt; 100–150 K/ps. Depending on the heating rate, various lattice destruction modes are realized. In the first case, destruction occurs due to the accumulated critical number of defects. In the second, the lattice destruction is carried out due to the high kinetic energy of the particles.</p>

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Peculiarities of Homogeneous Melting of Metal under the Action of Ultra-Short High-Power Laser Radiation

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. I. Mazhukin,
  • A. V. Shapranov,
  • M. M. Demin,
  • O. N. Koroleva,
  • A. V. Mazhukin

摘要

Abstract

The rapid development of femtosecond lasers facilitates the widespread use of laser technologies to solve many practical problems in such areas of material science as the development of new materials, high-precision micromachining of metals, including the process of homogeneous melting, and a number of other applications. One of the most complex physical problems has turned out to be femtosecond laser ablation, the mechanisms of which are being studied with great effort. Material research at high heating rates requires the development of new methods that are capable of tracking dynamic processes in materials with extreme spatio-temporal resolution. In this paper, a relatively simple mathematical model of the microlevel is developed to study fast interrelated processes in an overheated metastable crystal, in which a significant role belongs to the generation of structural defects. When structural defects reach certain conditions that lead to the appearance of stable nuclei of the liquid phase, the process of homogeneous melting occurs in the crystal. The determination of the main function, which is a function of the degree of crystal overheating, as well as the values of the parameters included in the proposed model, is carried out by molecular dynamics modeling of the process of homogeneous melting of a single crystal of aluminum. Using the constructed mathematical model, various crystal heating modes were investigated: with a low rate k < 100 K/ps and high values of the rate k > 100–150 K/ps. Depending on the heating rate, various lattice destruction modes are realized. In the first case, destruction occurs due to the accumulated critical number of defects. In the second, the lattice destruction is carried out due to the high kinetic energy of the particles.