Al-Mg-Si 系合金におけるナノクラスタの形成に対する溶質原子と空孔の局所的結合の影響

Kensuke Kurihara, Ivan Lobzenko, Tomohito Tsuru, Ai Serizawa

研究成果査読

抄録

Nanoclusters formed in Al-Mg-Si alloys affect the aging behavior of the alloys depending on the formation temperature. In the present study, first-principles calculations were carried out to evaluate the two- and three-body interactions between Mg, Si atoms and vacancies in the Al matrix and estimate the effect of local bond structures on the formation of nanoclusters. Monte Carlo simulations were subsequently performed to investigate the stable structure of nanocluster formed in Al-0.95 mass pct Mg-0.81 mass pct Si alloy. We found that the Mg-Si bond and Si-Vac bond were stable in the Al matrix. The result showed that the solute atoms are easy to aggregate with other types of solute atoms and that Si atom had a strong attractive interaction with a vacancy. Furthermore, Mg-Si-vacancy three-body bond was more stable than Mg-Si two-body bond and Si-vacancy two-body bond in the Al matrix. The results indicate that the nanoclusters in the Al matrix were thermally stabilized by the stable bonds between solute atoms and vacancy. Thus, the electronic structure calculations suggested that inner bonds within a nanocluster played a significant role in not only the thermal stability but also the formation and growth behavior of nanoclusters during aging at low temperatures.

寄稿の翻訳タイトルEffects of local bonding between solute atoms and vacancy on formation of nanoclusters in Al-Mg-Si alloys
本文言語Japanese
ページ(範囲)47-53
ページ数7
ジャーナルKeikinzoku/Journal of Japan Institute of Light Metals
72
2
DOI
出版ステータスPublished - 2022

Keywords

  • Al-Mg-Si alloy
  • first-principles calculation
  • nanocluster
  • thermal stability
  • vacancy

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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