First-principles study of hydrogen segregation at the MgZn2 precipitate in Al-Mg-Zn alloys

T. Tsuru, M. Yamaguchi, K. Ebihara, M. Itakura, Y. Shiihara, K. Matsuda, H. Toda

研究成果: ジャーナルへの寄稿学術誌査読

29 被引用数 (Scopus)

抄録

Hydrogen embrittlement susceptibility of high strength 7xxx series Al alloys has been recognized as the critical issues in the practical use of Al alloys. In spite of the recent improvement of experimental technique, the hydrogen distribution in Al alloys is still unclear. Focusing on the interface between MgZn2 precipitates and an Al matrix, which is considered as one of the important segregation sites in these alloys, we investigated the stable η-MgZn2–Al interface, and the possible hydrogen trap sites in MgZn2 and at the η-MgZn2–Al interface via first-principles calculation. Most of the interstitial sites inside the MgZn2 crystal were not possible trap sites because their energy is relatively higher than that of other trap sites. The trap energy of the most favorable site at the η-MgZn2–Al is approximately −0.3 eV/H, which is more stable that of the interstitial site at the grain boundary. The interface between MgZn2 and Al is likely to be a possible trap site in Al alloys. Moreover, hydrogen atoms do not tend to be trapped around Zn, but a trap site around Mg is favorable; this observation is consistent with previous experimental observations.

本文言語英語
ページ(範囲)301-306
ページ数6
ジャーナルComputational Materials Science
148
DOI
出版ステータス出版済み - 6月 1 2018

!!!All Science Journal Classification (ASJC) codes

  • コンピュータ サイエンス(全般)
  • 化学 (全般)
  • 材料科学(全般)
  • 材料力学
  • 物理学および天文学(全般)
  • 計算数学

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