Does microstructure matter for statistical nanoindentation techniques?

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• 作者：Franz-Josef Ulm ; Matthieu V ; amme ; Hamlin M. Jennings ; James Vanzo ; Michelle Bentivegna ; Konrad J. Krakowiak ; Georgios Constantinides ; Christopher P. Bobko ; Krystyn J. Van Vliet
• 关键词：Nanoindentation ; Statistical analysis ; Microstructure
• 刊名：Cement and Concrete Composites
• 出版年：2010
• 出版时间：January 2010
• 年：2010
• 卷：32
• 期：1
• 页码：92-99
• 全文大小：735 K

文摘

In their paper, Trtik et al. (2009) identify spurious peaks in the application of statistical nanoindentation technique as a critical obstacle for mechanical phase identification. In this discussion, we show that Trtik et al.’s finding is a consequence of an unrealistic virtual 3-D checkerboard microstructure considered by the authors. These peaks are not a general feature of indentation on multiphase materials, nor can the presence of such peaks be attributed to an intrinsic shortcoming of the grid-indentation technique. We also show that the authors’ assertion of the absence of homogeneous material regions extending beyond 3 μm in cementitious materials is groundless.