纳秒激光冲击纳米SiC涂层的有限元模拟和实验研究
首发时间:2013-11-25
摘要:基于传统激光冲击技术的基本原理,以纯铝(Al)为基体开展了激光冲击力效应下纳米SiC涂层的直接制备研究。利用有限元数值模拟方法研究了不同能量下激光冲击纳米SiC颗粒嵌入铝基体的运动过程,在此基础上进行了激光冲击制备纳米SiC涂层的实验研究,通过扫描电镜观察了纳米SiC涂层的表面微观结构特征。研究表明,强激光冲击波对团聚的纳米SiC颗粒起到了分散作用,在高达Gpa量级的冲击应力波作用下,分散的纳米SiC颗粒被压入金属基体表面,由几乎无结合作用的结合方式转变为机械咬合或"微焊合"等较强的界面结合方式,形成纳米颗粒增强涂层。
关键词: 激光技术 激光冲击 纳米SiC颗粒 数值模拟 微观组织
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Finite element simulation and experiment study of nano-SiC coating on Al surface using nano-second laser shock processing
Abstract:Based on the basic principles of traditional laser shock processing (LSP), a nano-SiC coating was successfully fabricated on pure Al surface. The movement process of the nano-SiC particles under different laser energies shock using the finite element numerical simulation method. And the experimental study is carried out using the LSP and the surface microstructure of the nano-SiC coating is observed by scanning electron microscope. The results show that the high-pressure laser impact stress waves play an important role in the dispersion of the nano-SiC particles. And the dispersed nano-SiC particles are instantaneously hammered into Al surface. The bonding mode between the nano-SiC particle and the Al substrate is converted from almost no binding into mechanical occlusion or "micro welding" binding modes. Finally, the nano-particle reinforced coating is formed on Al surface.
Keywords: laser technique laser shock processing nano-SiC particle numerical simulation microstructure
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