The possible transition mechanism for the meta-stable phase in the 7xxx aluminium

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  • Artenis Bendo
    Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama, Japan
  • Kenji Matsuda
    Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama, Japan
  • Katsuhiko Nishimura
    Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama, Japan
  • Norio Nunomura
    Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama, Japan
  • Taiki Tsuchiya
    Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama, Japan
  • Seungwon Lee
    Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama, Japan
  • Calin D. Marioara
    Materials and Nanotechnology, SINTEF Industry, Trondheim, Norway
  • Tomohito Tsuru
    Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
  • Masatake Yamaguchi
    Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
  • Kazuyuki Shimizu
    Department of Materials Science and Engineering, Iwate University, Iwate, Japan
  • Hiroyuki Toda
    Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan

説明

<jats:p> Metastable phases in aluminium alloys are the primary nano-scale precipitates which have the biggest contribution to the increase in the tangible mechanical properties. The continuous increase in hardness in the 7xxx aluminium alloys is associated with the phase transformation from clusters or GP-zones to the metastable η′ phase. The high-resolution electron imaging is used to observe the precipitates and reconstruct a kinetic model that might explain the transformation. This work is an attempt to gain insight into how the structural transformation may occur based on the shortest route of diffusion for the eventual structure to result in that of the η′ phase. </jats:p>

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