C15-Al₂Ca Precipitation in a Mg-Al-Ca Alloy

• Kashiwase Sakiko

  Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology

• Unekawa Mariko

  Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology

• Hisazawa Hiromu

  Graduate School of Technology, Industrial and Social Sciences, Tokushima University

• Terada Yoshihiro

  Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology

書誌事項

タイトル別名

• C15–Al₂Ca Precipitation in a Mg–Al–Ca Alloy

抄録

The coarsening kinetics of a fine C15–Al₂Ca Laves phase with a plate-like morphology precipitated within the primary α-Mg grains were investigated for Mg–5Al–1.5Ca alloy aged at 523 K. The Al₂Ca precipitate coarsened as its coherence was retained in the aging time below 300 h, and a quantitative relationship was obtained between precipitate length (l) and aging time (t) as l ∝ t^0.23. However, the α/C15 coherent interface changed into a semi-coherent interface by introduction of misfit dislocations on the planar surface of the precipitates in the aging time above 300 h, which resulted in the promotion of Al₂Ca coarsening. The Al₂Ca phase was assumed to precipitate through a nucleation and growth mechanism rather than spinodal decomposition, and its coarsening was explained using the terrace-ledge-kink mechanism. The result shows that the aspect ratio of the Al₂Ca precipitates was predominantly determined by the aging temperature, and it decreased at higher aging temperatures.   This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 83 (2019) 282–287.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 61 (2), 375-380, 2020-02-01

  公益社団法人 日本金属学会

キーワード

• magnesium alloy
• Laves phase
• HRTEM
• coarsening
• coherency

詳細情報

• CRID: 1390283659846040064
• NII論文ID: 130007790215
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.mt-m2019291
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 030222688
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I030222688
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/61/2/61_MT-M2019291/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可