Characterization of Precipitates in Mg-Sm Alloy Aged at 200°C, Studied by High-Resolution Transmission Electron Microscopy and High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy

• Nishijima Masahiko

  Institute for Materials Research, Tohoku University

• Hiraga Kenji

  Institute for Materials Research, Tohoku University

• Yamasaki Michiaki

  Department of Materials Science, Kumamoto University

• Kawamura Yoshihito

  Department of Materials Science, Kumamoto University

書誌事項

タイトル別名

• Characterization of Precipitates in Mg-Sm Alloy Aged at 200°C, Studied by High-Resolution Transmission Electron Microscopy and High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy
• Characterization of precipitates in Mg Sm alloy aged at 200degrees celsius studied by high resolution transmission electron microscopy and high angle annular detector dark field scanning transmission electron microscopy

抄録

Precipitates in an Mg-0.99 at%Sm (Mg_99.01Sm_0.99) alloy aged at 200°C were studied by the combination of high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). Fine precipitates of a meta-stable phase, which is called γ here, in the alloy aged at 200°C for 4 h have a thin lens-shape with a thickness of 2–5 nm and a diameter of 20–60 nm. The γ precipitate has an incommensurate structure with an orthorhombic unit cell of a=2a₀=0.64 nm, b\\fallingdotseq6a₀\\sqrt3=3.334 nm and c=c₀=0.52 nm, where a₀ and c₀ are lattice constants of a hexagonal unit of the Mg-matrix. In the early stage of aging at 200°C for 0.5 h, isolated structure units forming the γ structure are dispersed in an Mg hexagonal lattice. By annealing at 200°C for 100 h, coarse precipitates of a stable Mg₃Sm phase are formed along grain boundaries and inside grains of the Mg-matrix, and wide γ precipitate-free zones appear around them.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 50 (7), 1747-1752, 2009

  公益社団法人 日本金属学会

キーワード

• magnesium-samarium
• magnesium-rare earth alloy
• precipitate
• crystal structure
• high-resolution transmission electron microscopy (HRTEM)
• high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM)

詳細情報

• CRID: 1390282679226467328
• NII論文ID: 10025154058
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.m2009046
• COI: 1:CAS:528:DC%2BD1MXhtVChurbM
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 10265948
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10265948
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/50/7/50_M2009046/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可