Institut de Ciència de Materials de Barcelona, Campus de la Universitat Autònoma de Barcelona, E-08193-Bellaterra, Spain; and Center of Bioelectronics and Nanobioscience and Departament de Química Física, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
Proc Natl Acad Sci U S A. 2002 Apr 16;99(8):5228-32. doi: 10.1073/pnas.042106699. Epub 2002 Apr 9.
The mechanical properties of surfaces of layered materials (highly oriented pyrolytic graphite, InSe, and GaSe) and single-crystal ionic materials (NaCl, KBr, and KCl) have been investigated at the nanometer scale by using nanoindentations produced with an atomic force microscope with ultrasharp tips. Special attention has been devoted to the elastic response of the materials before the onset of plastic yield. A new model based on an equivalent spring constant that takes into account the changes in in-plane interactions on nanoindentation is proposed. The results of this model are well correlated with those obtained by using the Debye model of solid vibrations.
采用原子力显微镜的超尖锐探针进行纳米压痕,研究了层状材料(高取向热解石墨、InSe 和 GaSe)和单晶离子材料(NaCl、KBr 和 KCl)表面的力学性能。特别关注了在塑性屈服开始之前材料的弹性响应。提出了一种基于等效弹性常数的新模型,该模型考虑了纳米压痕过程中面内相互作用的变化。该模型的结果与使用固体振动的德拜模型得到的结果很好地相关。