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采用结合双温方程的分子动力学方法,数值模拟脉宽为200 fs,能量密度为30~45 m J/cm2的超快激光与Cu Zr非晶合金的相互作用过程。模拟结果表明:超快激光作用下Cu Zr非晶材料中原子加热速度比普通晶态金属慢得多;作用过程内部应力的演化表现为首先产生拉应力;并且随着温度与应力的演化,靶材内部产生空泡,空泡的平均大小和数目都与能量密度直接相关;靶材的烧蚀机制表现为机械破损,且烧蚀深度随着能量密度增大而增加。研究结果有助于更深入地理解飞秒激光与非晶合金相互作用机理。
The molecular dynamics method combined with two temperature equations was used to simulate the interaction of ultrafast laser with Cu Zr amorphous alloy with pulse width of 200 fs and energy density of 30-45 m J / cm 2. The simulation results show that the atomic heating speed of Cu Zr amorphous material is much slower than that of ordinary crystalline metal under the action of ultrafast laser light. The evolution of internal stress in the course of action is first to produce tensile stress. And with the evolution of temperature and stress, The average size and number of cavities are directly related to the energy density. The ablation mechanism of the target material is mechanical damage, and the ablation depth increases with the increase of energy density. The results contribute to a deeper understanding of the interaction mechanism between femtosecond laser and amorphous alloy.