Nanoindentation size effect in alkali-halide single crystals

作者：Soifer YM^*; Verdyan A; Rapoport L

来源：Materials Letters, 2002, 56(3): 127-130.

DOI：10.1016/S0167-577X(02)00559-1

• nanoindentation
• alkali-halide single crystal
• atomic force microscopy

Nanoindentation size effect has been investigated at very low loads in (001) LiF and KCl single crystals. All the measurements were carried out with DI Dimension 3 100 equipped with a diamond tip. Simultaneously, the topography of the sample surface were done by using tapping mode atomic force microscopy (AFM). For both crystals, the indentation size effect (for loads from 5 to 400 muN) was found. The results obtained are discussed in the terms of the model of geometrically necessary dislocations proposed to interpretation of indentation size effect. The experiments show that the square of the nanohardness H-2 vs. the inverse of indentation depth, 1/h, is a linear dependence, that is in a good qualitative agreement with the predictions of the model. However, as follows from the experiments presented, for quantitative estimates, it is necessary to take into account a microscopic mechanisms of the indent formation.

• 出版日期2002-10