中性子回折法によるセラミックス複合材料の熱残留応力測定(<特集>X線材料強度)

概要

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The neutron diffraction method was used to measure the residual stress in ceramic composites of alumina mixed with various volume fractions of zirconia, Al_2O_3/ZrO_2, and of silicon carbide, Al_2O_3/SiC. The thermal residual stresses of the zirconia phase, alumina phase and silicon carbide phase were measured as a function of the volume fraction of constituent phase. The phase stresses were determined from the neutron diffractions of ZrO_2 202, Al_2O_3 113, Al_2O_3 116, SiC 220 and SiC 311. In Al_2O_3/ZrO_2 composites, the residual stress in the alumina phase was compression and that in the zirconia phase was tension. On the other hand, in Al_2O_3/SiC composites, the residual stress in the alumina phase was tension, and increased linearly with the silicon carbide volume fraction. The residual stresses were introduced by the mismatch of the coefficient of thermal expansion. The change of the residual stress with volume fraction of constituent phase agreed well with the theoretical prediction based on Eshelby's inclusion model.
2000-07-15