その場顕微蛍光分光法によって解析したアルミナセラミックスの破壊挙動に及ぼす粒子形状の影響

概要

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An in situ fluorescence microprobe spectroscopy approach is applied to clarify the effect of grain morphology on fracture toughness of Al_2O_3 ceramics. Fluorescence spectroscopy enables to experimentally determine a map of the crack-wake bridging stress distribution with micrometer precision and, thus, to predict the R-curve and the crack opening displacement(COD)behavior of the material. Platelet-shape grain morphology was found to significantly enhance the bridging stresses in the neighborhood behind the crack tip, as compared to equiaxed Al_2O_3. Amaximum bridging stress of about 350 MPa was found to arise from elastic bridging sites, according to microscopy observation. The experimentally determined bridging stress distribution produces a rising R-curve behavior and a COD profile consistent with those experimentally measured.
社団法人日本材料学会の論文
1999-09-15