時効硬化したダイカスト用アルミニウム合金の析出相の透過電子顕微鏡観察

• 今野 豊彦

  東北大学金属材料研究所

• 佐々木 翔平

  東北大学大学院生

• 濱岡 巧

  東北大学金属材料研究所

書誌事項

タイトル別名

• Transmission electron microscopic observation of precipitates in age-hardened die-cast aluminum alloys
• ジコウ コウカ シタ ダイカストヨウ アルミニウム ゴウキン ノ セキシュツソウ ノ トウカ デンシ ケンビキョウ カンサツ

抄録

Squeeze die casting with a composition similar to JIS ADC12 aluminum alloy was aged at 453 K with or without prior solution treatment. Aging following solution treatment, which is termed T6-treatment, increased the hardness of this alloy. Using transmission electron microscopy, we investigated precipitates responsible for the age-hardening. Concentration of solute silicon, copper and magnesium during aging led to the formation of several types of precipitates in the matrix face-centered cubic (fcc) Al-phase. Precipitates exhibiting equiaxed shape and possessing copper-enriched faces at the interface with the Al-phase were observed. We suggest that these precipitates have fcc structure containing silicon, copper and magnesium atoms substituting for aluminum. Prolonged aging caused the formation of another type of precipitates with elongated shape, and they were identified to be the S″-phase. Some regions within the precipitates of the S″-phase transformed into the Q-phase with increasing silicon content in the precipitates. Precipitates of the S-phase and θ′-phase also formed by over-aging.

収録刊行物

• 軽金属

  軽金属 66 (6), 291-297, 2016

  一般社団法人 軽金属学会

キーワード

• ADC12 aluminum alloy
• age-hardening
• precipitation
• transmission electron microscopy

詳細情報

• CRID: 1390282681316840576
• NII論文ID: 130005253779
• NII書誌ID: AN00069773
• DOI: 10.2464/jilm.66.291
• ISSN: 18808018
• ISSN: 04515994
• NDL書誌ID: 027435484
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027435484
• Web Site: https://www.jstage.jst.go.jp/article/jilm/66/6/66_660601/_pdf
• 本文言語コード: ja
• 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