Direct evidence of the formation of Al2Au nanocrystals at the alloy-film interface of anodized Al-Au alloys

H. Habazaki, T. J. Konno, K. Shimizu, P. Skeldon, G. E. Thompson, G. C. Wood, X. Zhou

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Anodic oxidation of many dilute aluminium alloys results in alloy layers about 1-2 nm thick, just beneath the anodic film, suggested to contain clusters rich in alloying elements, although direct evidence of their existence is lacking. The present high-resolution transmission electron microscopy study discloses discrete Al2Au nanocrystals in the gold-enriched layer on anodized Al-Au alloys containing 0·4 and 3·8at.% Au. For the single-phase 0·4at.% Au alloy, the nanocrystals form as a consequence of enrichment of gold in the alloy through initial oxidation of aluminium atoms. For the 3·8at.% Au alloy, composed of fcc aluminium and Al2Au phases, the nanocrystals are derived from the bulk alloy by the retreat inwards of the alloy-film interface and are also produced following preferential oxidation of aluminium in the fcc matrix phase.

Original languageEnglish
Pages (from-to)267-272
Number of pages6
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume77
Issue number1
DOIs
Publication statusPublished - 1998 Jan

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys

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