Abstract
AbstractOptical study of mechanical response indicated by Knoop indentation of cleavage faces of natural rhombohedral clacite crystals based on MEYER'S law/KICK'S law (P adn) and also on modified KICK'S law (P–W) = bd2 is made. The response of cleavage faces for low load region (LLR) and high load region (HLR) of applied loads P to produce indentation mark of longer diagonal length is different. In LLR the Newtonian resistance pressure W is negative and varies with orientation and quenching temperature whereas in HLR it is positive and almost constant at room temperature and quenching temperatures. In LLR, W indicates crystal anisotropy. The values of resistance pressure W2 and standard hardness b2 in HLR are independent on thermal treatment and are constant within experimental limits. Since they are independent on indenter orientations, they are not associated with crystal anisotropy.
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