The age-hardening characteristics of an AI-6061/AI2O3 metal matrix composite

Jingtao Wang, Minoru Furukawa, Zenji Horita, Minoru Nemoto, Yan Ma, Terence G. Langdon

    Research output: Contribution to journalArticlepeer-review

    30 Citations (Scopus)


    Experiments were conducted to determine the age-hardening behavior of an Al-6061 metal matrix composite reinforced with ∼20 vol pct of A12O3 microspheres and prepared using liquid metallurgy processing. The presence of alumina microspheres increases the dislocation density in the matrix of the composite in the as-quenched state and, by comparison with the monolithic alloy, this leads to a significant increase in the yield stress in the as-quenched and unaged condition. From measurements of the 0.2 pct proof stress, there is no evidence for any significant acceleration in the aging process in the composite material: both materials attain similar peak-aged conditions after essentially the same aging times. The microstructures of the composite and the monolithic alloy are similar in the peak-aged condition, with a high density of fine needlelike β″ precipitates and, in the over-aged condition, with a reasonably homogeneous distribution of the rod-shaped β′ phase. It is proposed that the aging behavior is better quantified by determining the yield stress rather than by taking hardness measurements. Formerly Visiting Scholar, Kyushu University,

    Original languageEnglish
    Pages (from-to)581-587
    Number of pages7
    JournalMetallurgical and Materials Transactions A
    Issue number3
    Publication statusPublished - Mar 1995

    All Science Journal Classification (ASJC) codes

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


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