轻合金热/力耦合植入颗粒型纳米薄膜的可控制备及协同强化机制

项目名称： 轻合金热/力耦合植入颗粒型纳米薄膜的可控制备及协同强化机制

项目编号： No.51275220

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 鲁金忠

作者单位： 江苏大学

项目金额： 80万元

中文摘要： 轻合金由于表面强度和硬度较低、耐磨性能差，严重阻碍了其工程应用，提高轻合金的表面性能成为结构件制造中的关键问题之一。本项目拟开展动态应变时效温度下激光喷丸(热/力耦合)植入颗粒型轻合金纳米薄膜的制备理论及协同强化机制研究，探索提高轻合金表面力学性能的方法。系统研究热/力耦合条件下工艺参数对植入颗粒型纳米薄膜的表面完整性、摩擦磨损性能和高温疲劳性能的影响规律，分析纳米颗粒扩散行为、位错运动以及耦合作用过程，建立轻合金应力-应变本构关系及工艺参数-微观结构-宏观性能的强关联关系，阐明深度方向的微观结构演变规律，获得碳基纳米薄膜制备工艺准则，揭示热/力耦合作用下纳米薄膜的协同强化机制，实现轻合金热/力耦合植入颗粒型纳米薄膜结构和功能的预测与控制。相关研究内容涉及众多全新科学问题，其研究成果可以丰富和发展轻合金表面改性基础理论和技术，为轻合金大规模的工业应用开辟一条新的道路。

中文关键词： 激光冲击波；热/力耦合作用；颗粒植入；纳米薄膜；协同强化机制

英文摘要： The engineering application of light alloys is limited for their low intensity, low hardness and poor wear performance, so it is urgent to improve their surface mechanical property in the manufacturing process of structural components. In this proposal, a novel fabrication method of carbon-based nanofilm is proposed to improve surface mechanical properties of light alloys, which is realized by implanting WC or SiC nanoparticles into the surface of light alloys through laser shock peening under dynamic strain aging temperature (so-called coupled thermo-force effects). To achieve the fabrication principles of carbon-based nanofilm and clarify its collaborative strengthening mechanism, some important fundamental issues are addressed in this proposal. The first is to investigate the effects of processing parameters on the surface integrity and mechanical properties including friction, wear properties, and high temperature fatigue performance of carbon-based nanofilm. The second is to analyze the diffusion behavior of nanoparticles and dislocation motion, and their coupling interactions process. The third is to develop the stress-strain constitutive relation and strong correlations between the preparation parameters, microstructure and mechanical performance in system. The last is to investigate the microstructural

英文关键词： laser shock wave；coupled thermal-mechanical effect；nanoparticle implanting；nanofilm；collaborative strengthening mechanism