Effects of microstructure on residual stresses in DSE Al2O3/YAG ceramic composite by experimental and numerical investigations

J. J. Sha, S. Ochiai, H. Okuda, S. Iwamoto, Kohei Morishita, Y. Waku, N. Nakagawa, A. Mitani, T. Ishikawa, M. Sato

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The effect of microstructure on the residual stresses in directionally solidified eutectic (DSE) Al2O3/Y3Al5O12 (YAG) ceramic composite were investigated by X-ray diffraction technique and finite element method (FEM). In the X-ray stress measurement, the YAG skeleton derived from the Al2O3/YAG composite by dioxidation of the Al2O3 phase was used as a reference specimen without thermally-induced stress, and the X-ray stress measurements with CuKα1 irradiation were performed on the two faces of a cubic specimen, namely, the faces parallel and perpendicular to the solidification direction, respectively. On the other hand, a numerical analysis using finite element method (FEM) which represents the actual microstructure features of the experimental specimen was carried out in different local regions with different morphologies to reveal the effect of microstructure on the distribution of residual stress in the composite. The distributions of residual stresses in both constituting phases were mapped by FEM calculation. Meanwhile, the mapping of residual stress indicated that the distribution of residual stress in the interior of each phase was not homogeneous being dependent on the solidification direction and local morphologies of constituting phases such as curvature of interfaces, array and volume fraction. The experimentally measured residual stresses were accounted for by the FEM analysis.

Original languageEnglish
Title of host publicationCeramic and Polymer Matrix Composites
Subtitle of host publicationProperties, Performance and Applications
PublisherNova Science Publishers, Inc.
Pages87-118
Number of pages32
ISBN (Print)9781607418962
Publication statusPublished - Dec 1 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Materials Science(all)

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