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中文核心期刊

纳米压痕仪接触投影面积标定方法的研究

Comments on the calibration technique of the projected contact area of nanoindentation tester

  • 摘要: 基于Oliver与Pharr方法的纳米压痕实验以其简单方便获得广泛的应用,但众多因素对压痕实验结果的影响范围并无明确的结论. 其中压痕接触面积的确定是一个重要环节,该因素对实验结果,特别是小深度下的实验结果具有重要影响. 仔细分析了Oliver与Pharr方法并进行了几种材料的纳米压痕实验,针对该方法在接触深度确定、不同深度范围下方法的适用性进行了说明. 分析结果表明,对所有的材料使用统一的面积公式,只有在大压痕深度时才是适用的,而在小压痕深度时可能带来较大的误差. 因此,应慎重使用由Oliver与Pharr方法得到的小压痕深度的硬度数据.

     

    Abstract: The nanoindentation test techniques especially the O&P method are analyzed and the nanoindentation tests are implemented. The analysis focuses on the determination of the contact area and the depth region of the application. Analysis results show that a common area formula for all materials justified only at large indentation depth, and such a universal formula may lead to larger errors at small depth. Hence hardness values measured at small indentation depth based on O&P method must be used with care.

     

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