Microstructural control by retrogression and reaging treatment in SiC whisker reinforced aluminum alloy composite

Hiroyuki Toda, Toshiro Kobayashi, Mitsuo Niinomi

Research output: Contribution to journalArticle

Abstract

STEM-EDX analysis has been carried out to study segregation in the SiCw/6061 Al composite, and Mg was found to be segregated at reinforcement-matrix interfaces. It is shown that the segregation of Mg to the interface is consistent with the hypothesis of non-equilibrium segregation based on the vacancy-drag mechanism. A method is described of thermally treating the MMC to improve and tailor its precipitation structure according to these informations. The method comprises subjecting the MMC for a short period of time above a solvus temperature of the GP (II) zone or β′ transition phase, and a subsequent aging treatment. Partial dissolution of the GP zone or the transition phase is caused by dependence of the solvus temperatures on the solute concentration, and produces a more homogeneous distribution of the precipitates after the re-aging treatment. The beneficial effects on the mechanical properties of the MMC became clear, and its mechanism has been investigated.

Original languageEnglish
Pages (from-to)1086-1094
Number of pages9
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume58
Issue number9
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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