作　　者： (王锋）;

机构地区： 重庆大学动力工程学院,重庆400030 重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处： 《材料导报》 2017年第14期138-142,共5页

摘　　要： 为提高镁合金的抗腐蚀性能,以冷喷涂方法在其表面喷涂铝颗粒并采用有限元ALE网格方法对该过程进行了数值计算。考察了颗粒和基板的变形特性、温度分布;研究了颗粒形状、颗粒和基板初始温度对其沉积过程、颗粒反弹特性等的影响。结果表明,颗粒形状对系统局部变形影响较大;颗粒形状及速度对其反弹能、基板表面坑深、最大接触面积等也有较大影响。对系统预热有利于颗粒和基板的结合。当椭球形颗粒沿着其长轴碰撞以及球形颗粒碰撞时,温度和塑性变形都对称分布。结果可初步用于冷喷涂实验参数的选择和优化。 In order to improve magnesium alloy anti-corrosion performance,cold spray technology was adopted as surface modification method and particles deposition process has been simulated.In this work,finite element analysis（FEA）with Arbitrary Lagrange Eulerian（ALE）grid method was used to simulate Al particles deposition behavior on Mg alloy substrate in cold spray.The deformation process and temperature distribution in particle and substrate were investigated.Effects of particle shape,different particle and substrate initial temperature on particle deposition and rebound performance were also considered.Results show that the effect of particle shape on its local deformation and substrate deformation in impact process is significant.It is found that the effects of particle initial shape and velocity on particle rebound kinetic energy rate,substrate crater depth,maximum relative contact area between particle and substrate are obvious.Preheating of particle-substrate system is beneficial to their combination.The distributions of temperature and plastic deformation are symmetric when ellipsoid particle impacts on substrate vertically along its long axis and sphere particle impacts on substrate vertically.Results can be used as a reference for cold spray experiment parameters selection and optimization.

关 键 词： 冷喷涂 镁合金 铝颗粒 塑性变形 颗粒形状