激光处理非晶化合金表面的结构和性能研究

项目名称： 激光处理非晶化合金表面的结构和性能研究

项目编号： No.51271008

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 逄淑杰

作者单位： 北京航空航天大学

项目金额： 80万元

中文摘要： 非晶合金的高耐腐蚀性能和高硬度使其非常适合应用于表面及涂层材料。近二十年来，大量块体非晶合金的发现使采用激光处理获得理想的非晶表面成为可能。我们研究发现，利用激光表面熔化使合金表面非晶化不仅可以改善表面性能，且形成了从非晶表面到晶态基体的层次丰富的结构梯度。因此，针对采用激光表面处理实现合金表面非晶化和所获得的表面结构与性能开展研究在基础和应用方面都具有重要价值。本项目拟系统研究合金的非晶形成能力及激光表面熔化工艺对表面非晶层的形成及厚度的影响，揭示从非晶表面到晶态基体的多层次结构形成机理，建立腐蚀、摩擦磨损行为与合金结构及残余应力的关联，并探索熨压加工等进一步改善非晶合金腐蚀行为等性能的新途径。在此基础上，探索在商用铝合金等表面激光熔覆制备高性能非晶涂层。本项目工作将为利用激光处理制备非晶表面及控制合金表面性能提供理论和实验基础，进一步理解合金表面性能与结构的关系，促进非晶合金的应用。

中文关键词： 非晶合金；激光表面处理；结构；腐蚀；磨损

英文摘要： Metallic glasses are promising corrosion resistant and anti-ware surface and coating materials due to the high corrosion resistance and hardness. In the past two decades, a number of bulk metallic glasses with high glass-forming ability have been developed, which make it possible to synthesize vitrified alloy surface by laser surface treatment. In our recent work, we found that surface vitrification of some alloys by laser surface melting can not only improve the surface properties, but also enables the formation of a structure gradient from the glassy surface to the crystalline substrate. Therefore, the studies on the surface vitrification of alloys by laser surface treatment and the resultant microstructure and properties are of great significance for the fundamentals and applications of metallic glasses. In the proposed project, the effects of glass-forming ability of alloys and laser surface melting parameters on the formation and thickness of glassy surface layer will be studied, and the formation mechanism of the gradient structure from the glassy surface to the crystalline substrate will be clarified. The correlation between the corrosion and tribological behaviors of the laser surface vitrified alloys and the microstructure as well as residual stress will be established. The effects of burnishing process

英文关键词： metallic glass；laser surface treatment；microstructure；corrosion；wear