Effect of debonding at the phase interface on Young's modulus in sintered PSZ/stainless steel composite

Yoko Yamada, Akira Kawasaki, Minoru Taya, Ryuzo Watanabe

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A theoretical estimation has been made on the effect of debonding at the phase interface on Young's modulus in the sintered PSZ/stainless steel composite, where an abnormal deterioration of Young's modulus has been observed. The present analysis is based on Eshelby's equivalent inclusion method and on a debonding model. The comparison is made between the theoretically predicted Young's modulus and experimental data for the composites having three different combinations of original powder sizes. The theoretical calculation shows that the Young's modulus decreases with increasing fraction of debonding. The fraction of debonding can be, in turn, predicted by comparing the theoretical calculation with the experimental data, which has been found to depend on the composition of PSZ and original particle size. The particle size dependence on debonding has been discussed on the basis of the Weibull theory, which shows that the coarser dispersoids have more debonded interfaces. The composition dependence has been explained by the variation in interface residual stress with composition, which is generated by the mismatch of thermal expansion coefficient between the matrix and the dispersed particles, and the residual stress is compressive at the metal-rich side and tensile at the ceramic-rich side. The tensile stress at the interface enhances the debonding, however, the compressive stress defend it and improve the Young's modulus. The dependence of abnormal deterioration of Young's modulus on the composition and particle size has been well accounted for.

Original languageEnglish
Pages (from-to)162-168
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume58
Issue number2
DOIs
Publication statusPublished - 1994 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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