Abstract
The conditions of plastic-to-brittle transition during microscratching with a Vickers diamond indentor of natural cleavage surfaces of lithium fluoride (LiF) single crystals (pure samples and those covered with octadecylamine films) in heptane, distilled water, and their saturated aqueous solution, were studied. Indentor loads varied in the range 3.2×10−3-1.9×10−1 N; indent or sliding velocity was 30 μm s−1. Quantitative characteristics of microplasticity and microbrittleness of near-surface layers in single crystals under appropriate test conditions were studied. The basic mechanisms of crack formation in non-uniform indentor-induced fields of stresses and deformations were revealed and the active media effect on the relative intensity of the functioning of these mechanisms was analysed.
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Kochanova, L.A., Kuchumova, V.M., Savenko, V.I. et al. Environmental effect on sclerometric brittleness of ionic crystals. J Mater Sci 27, 5516–5522 (1992). https://doi.org/10.1007/BF00541614
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DOI: https://doi.org/10.1007/BF00541614