Kinetic analysis of spinel formation at the interface of CaO-Al2O3 fibre-reinforced Al 7075 composites

Yun Mo Sung, Jae Woo Ahn

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A kinetic analysis was performed on the spinel (MgAl2O4) formation reaction at the interfacial region of the calcium aluminate (CaO-Al2O3) fibre-reinforced aluminum 7075 alloy matrix composites (CA/Al 7075) processed at 1200°K. The counterdiffusion model of Mg2+ and Al3+ fluxes was employed for the spinel formation reaction. From the parabolic relation between the thickness of the spinel layer and time the reaction rate constant was determined to be a function of the average diffusion coefficient of Al3+ ions. By applying the parabolic equation to the experimental data of the CA/Al 7075 the average diffusion coefficient of Al3+ ions in the MgAl2O4 spinel at 1200°K was calculated and this value appeared to be in small deviation from the extrapolation of previous diffusion coefficient data.

Original languageEnglish
Pages (from-to)5127-5132
Number of pages6
JournalJournal of Materials Science
Volume34
Issue number20
DOIs
Publication statusPublished - 1999 Oct 15

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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