Structural Changes of Precipitates in an Mg-5 at%Gd Alloy Studied by Transmission Electron Microscopy

• Nishijima Masahiko

  Institute for Materials Research, Tohoku University

• Hiraga Kenji

  Institute for Materials Research, Tohoku University

書誌事項

タイトル別名

• Structural Changes of Precipitates in an Mg 5 atパーセントGd Alloy Studied by Transmission Electron Microscopy

抄録

Structural changes of precipitates in an Mg-5 at%Gd (Mg₉₅Gd₅) alloy by aging at 200°C and 250°C have been studied by ordinary high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). In the early stage of precipitation by aging at 200°C up to 5 h, a short-range ordered structure exists in Gd-enriched regions with an about 2 nm size, and nuclei of an Mg₇Gd structure (β′ phase) occur in the short-range ordered structure by aging at 200°C for 5 h. The β′ phase with the Mg₇Gd structure is formed as definite precipitates by aging at 200°C for 10 h. The β′ precipitates are joined along the b-axis and form a plate-shape with a thickness of about 20 nm along the a-axis, and lengths of about 200 nm along the b-axis and 200 nm along the c-axis, and the connection of planar precipitates along the three directions, which are parallel to the [210]_m-typed directions of the Mg-matrix, forms a two-dimensional cell structure, by top-aging at 200°C for 100 h.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 48 (1), 10-15, 2007

  公益社団法人 日本金属学会

キーワード

• magnesium alloy
• magnesium-rare earth alloy
• precipitation hardness
• magnesium-gadolinium
• Mg-Gd
• precipitate
• high-resolution transmission electron microscopy (HRTEM)
• high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM)

詳細情報

• CRID: 1390001204249446784
• NII論文ID: 130004453330
• NII論文ID: 10018665955
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.48.10
• COI: 1:CAS:528:DC%2BD2sXit1Whs7s%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 8597164
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8597164
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/48/1/48_1_10/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可