Enhanced Age Hardening in an Al-Mg-Si Alloy Using High-Speed Compression

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  • Horikawa Keitaro
    Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University
  • Kitani Yuki
    Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University
  • Ogura Tomo
    Division of Material and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Hirose Akio
    Division of Material and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Takahashi Makoto
    Joining and Welding Research Institute, Osaka University
  • Kobayashi Hidetoshi
    Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University

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The age hardening of an Al-Mg-Si alloy was enhanced by the effect of high-speed (105 s−1) compression prior to aging. This enhancement of the age hardening is brought about by the formation of vacancy clusters during high-speed compression. High resolution transmission electron microscopy reveals that these vacancy clusters form stacking fault tetrahedra. Following peak aging, vacancy clusters and aging precipitates coexist in the grain interior. The high aging hardness obtained following high-speed compression is most probably due to the combined effects of vacancy and precipitation hardening.

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