金属材料在中强度激光辐照下的相变速度研究

在找出了使金属材料只发生液化相变的激光功率密度的前提下，借用金属液态与金属固态某些相似的性质，通过类比，给出了金属液化材料对激光的吸收率. 经过分析，指出了直接解析金属相变速度的不可能性. 通过建立金属液态内的能量方程，在质量守恒的前提下，求得了激光辐照金属的相变速度. 通过讨论发现，影响金属相变速度的因素不仅有激光的强度，而且还有激光的圆频率. 关键词： 金属材料 中强度激光 辐照 相变 速度

Phase transition speed research of metal material at laser irradiation medium strength

Under the condition that there is only solid_liguid transition in a metallic material, we found the laser power density for melting the material. Through analysis of the similarity of some behaviors of solid and ciquid states, we obtain the absorptivity of laser by the metal, and indicate the impossibility to directly calculate the transition rate of the metal. However, we can obtain the transition rate under the irradiation of laser, and find the relationship of the transition rate with the intensity and the frequency of the laser.