Residual strain in SiC composites containing particulate MeB2
The lattice constants of dispersed particles (2H-TiB 2 >, 2H-ZrB 2 sub>, 2H-VB 2 > and 2H-NbB 2 sub>) and the surrounding 6H-SiC matrix of the surfaces of sintered composite blocks and the corresponding pulverized powders, respectively, were evaluated by X-ray diffraction analyses. An X-ray diffraction technique applied to polished surfaces of composite blocks was found to be a useful method for analyzing such composites. The deformations of the unit cell volumes for 6H-SiC (shrinkage) and 2H-MeB 2 > (expansion) were respectively intensified and reduced in accordance with the increase of dispersed MeB 2 sub> particles. Both detected deformations were relaxed by a pulverizing procedure. The origin of both deformations was not any residual surface strain but the residual bulk strains which originate from a thermal expansion mismatch between the dispersed particles and the surrounding matrix. Moreover, Selsing's formulas for the residual bulk strains need to be improved to more generalized formulas.(Author abstract)
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