Abstract
Abstract The level of residual stress in SiC-particle-reinforced MgO composites has been investigated using X-ray diffraction. The significant difference in thermal expansion coefficients between SiC and MgO has resulted in the high residual stress in the composites. The stress measured has been compared with the calculated value evaluated using a Modified Eshelby's Model. Good agreement was obtained at low volume fractions of SiC addition to the MgO. At high volume fractions of SiC (>25%) a significant difference between measured and calculated values was obtained. This deviation has been shown to arise as a consequence of microcracking, which developed in the composites to release high levels of residual stress. The microcracking postulated as the strain relief mechanism was observed using TEM and SEM.
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