摘要
异质材料连接,尤其是金属和玻璃,广泛应用在各种工业产品上。超快激光焊接异质材料是一种快速、清洁和非接触的新技术,近年来得到了广泛研究。采用分子动力学方法对飞秒激光作用铝和石英玻璃界面进行了理论模拟研究,模拟根据石英玻璃的熔点和弹性常数,构建了石英玻璃的Lennard-Jones(LJ)相互作用势函数。根据铝-石英玻璃之间的黏附功,建立了铝-石英玻璃之间的LJ相互作用势函数,从而在保持宏观特性的同时简化和加速模拟过程。采用耦合到分子动力学的双温模型对飞秒激光作用铝和石英玻璃界面进行了小规模分子动力学模拟。飞秒激光辐照后,焊接区局部瞬时温度高达10000 K,应力高达20 GPa,出现铝原子向石英玻璃一侧扩散移动的现象。铝和石英玻璃的混合区由于高温粒子的持续碰撞而不断扩大,同时两种材料的混合区域中心向石英玻璃一侧移动,在微观上揭示了飞秒激光作用铝-石英玻璃界面皮秒时间尺度的分子动力学演化过程,为飞秒激光焊接异质材料提供理论基础。
The joining of dissimilar materials, especially metals and glass, is widespread in various industrial products.Ultrafast laser welding of heterogeneous materials is a fast, clean, and non-contact technique that has been extensively studied in recent years. In this study, molecular dynamics methods are used for simulating the femtosecond laser action at the interface between aluminum and quartz glass. The simulation constructed a Lennard-Jones(LJ) interaction potential for quartz glass according to its melting point and elastic constants. The construction of the LJ interaction potential between aluminum and quartz glass is based on the adhesion work between the two materials, thus simplifying and accelerating the simulation process while maintaining the macroscopic properties. A small-scale molecular dynamics simulation of the femtosecond laser action at the aluminum and quartz glass interface is performed using the two-temperature model coupled to molecular dynamics method. After femtosecond laser irradiation, the local transient temperature in the welding zone and stress are as high as 10000 K and 20 GPa, respectively, and diffusive movement of aluminum atoms to the quartz glass side occurs. The continuous collision of high-temperature particles causes the mixing zone of aluminum and quartz glass to expand, and the center of the mixing zone of the two materials moves toward the quartz glass side. The simulation reveals the molecular dynamics evolution of the femtosecond laser-action aluminum-quartz glass interface on the picosecond time scale at the microscopic level, providing a theoretical basis for femtosecond laser welding of dissimilar materials.
作者
闻锦程
张琳
吴寒
李萌
马修泉
Wen Jincheng;Zhang Lin;Wu Han;Li Meng;Ma Xiuquan(State Key Laboratory of Digital Manufacturing Equipment and Technology,School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;Guangdong Intelligent Robotics Institute,Dongguan 523808,Guangdong,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2023年第1期269-277,共9页
Laser & Optoelectronics Progress
基金
国家自然科学基金(81927805)
中国博士后科学基金(2018M632837)
广东省科技计划(2018B090944001)
广东省基础与应用研究重大专项(2019B030302003)
东莞市创新团队计划(201536000100031)
华中科技大学中央高校基本科研业务费专项资金(2019kfyXKJC062)
关键词
超快激光焊接
势能函数
玻璃
铝
分子动力学仿真
异质材料
ultrafast laser welding
potential energy function
fused silica
aluminum
molecular dynamics simulation
dissimilar material
