Characterisation of interfacial reaction in (Al2O3)p/6061 aluminium alloy composite

J. C. Lee, G. H. Kim, H. I. Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The interfacial characterisation of aluminium alloy 6061 reinforced with Al2O3 particles was carried out using scanning and transmission electron microscopy on interfacial sections and by X-ray diffraction on the reaction products extracted by electrochemical dissolution. The value of these combined techniques in elucidating the interfacial reaction mechanisms was demonstrated. Single crystals of MgAl2O4, of octahedral shape, were observed at the (Al2O3)p/Al interfaces together with surface erosions of (Al2O3)p which formed around the MgAl2O4 crystals. In the heat treated composite a reduction in precipitate density in the alloy matrix was observed in the vicinity of the (Al2O3)p. Based on the experimental observations and thermodynamic considerations, the MgAl2O4 crystals which formed at the surface of the (Al2O3)p are believed to grow by consuming Al2O3.

Original languageEnglish
Pages (from-to)182-186
Number of pages5
JournalMaterials Science and Technology
Volume13
Issue number3
DOIs
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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