Neutron Diffraction Study of Thermal Residual Stress in Ceramic Composite

概要

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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, was measured by the neutron diffraction method.The themal residual stress of each constituent phase was measured as a function of the second 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 linealy 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 the second phase agreed well with the theoretical prediction based on Eshelby's inclusion model.
社団法人日本材料学会の論文
2000-12-15