Abstract
Results of microhardness measurements on (100) and (110) planes of flux-grown LaBO3 crystals, in the applied load range of 10–100g, are presented. The microhardness was found to decrease with increasing load in a non-linear manner. By applying Hays and Kendall's law, the materials resistance pressure and other constants of the equation could be calculated. Hardness anisotropy, showing periodic variation of H v with the maxima and minima repeating at every 15° change in orientation of the indentor, is described and discussed. H max/Hmin are estimated as 1.14 and 1.06 for (100) and (110) planes, respectively. The fracture toughness values, K c, determined from measurements of crack lengths, are estimated to be 1.6, 1.7 MN m−3/2 (for (100) planes) and 1.2, 1.5 MN m−3/2 (for (110) planes) at 90 and 100g loads, respectively. The brittleness index, B i, is estimated as 4.6, 4.0 μm−1/2 (for (100) planes) 6.0, 4.6 μm−1/2 (for (110) planes) at 90 and 100g, loads respectively.
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Jain, A., Razdan, A.K., Kotru, P.N. et al. Load and directional effects on microhardness and estimation of toughness and brittleness for flux-grown LaBO3 crystals. JOURNAL OF MATERIALS SCIENCE 29, 3847–3856 (1994). https://doi.org/10.1007/BF00357358
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DOI: https://doi.org/10.1007/BF00357358