颗粒表面粗糙度对纳米压痕特性影响研究

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Research of influence of particle surface roughnesson nan0indentati0n resultsGU Sheng-ting，BAO Yu-mei，CHAI Guo-zhong，W U Hua-ping(Colege of Mechanical Engineering，Zheiiang University of Technology，Hangzhou 310032，China)Abstract：In the process of particle nanoindentation in composite coatings， the contact areacalculated from the maximum indentation depth is always influenced by the top of peak and thebottom of valley of the particle.A finite element(FE)model of particle-matrix nanoindentationwas developed and the particle morphology effect on nanoindentation results had been studied。

The results showed that the errors of elastic modulus and hardness calculated from load-displacement for particle indentation raised with increase of curve of particle surface.A simplemodel was developed to modified the calculation of contact depth and the results，compared withFE results，showed that the errors of elastic modulus and hardness were decreased，revealing thefeasibilitv 0f the mode1。

Key words：composite coatings；nanoindentation；finite element；elastic modulus and hardness复合涂层材料的力学性能撒于材料细观结构例如：颗粒与基体的性能、颗粒的体积分数、分布等。

然而由于复合涂层各相的微观特性，使用常规的测量方式已经不能满足要求.纳米压痕技术正逐渐成为微/纳米尺度力学测量的主要工作方式，尤其结合原子力显微镜(AFM)，不仅可以测量样品表面的粗糙度 ，而