Direct observation of nanoscale structural changes in bulk metallicglasses

2009 Fiscal Year Final Research Report

• Project/Area Number: 20760442
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Physical properties of metals
• Research Institution: Osaka University
• Principal Investigator: AKIHIKO Hirata Osaka University, 原子分子材料科学高等研究機構, 助教 (90350488)
• Project Period (FY): 2008 – 2009
• Keywords: 原子 / 電子構造

Research Abstract

I have examined nanoscale structural changes during crystallization in Fe-based bulk metallic glasses mainly by means of transmission electron microscopy. As a result, the crystallization took place via a formation and sequence change of atomic clusters rather than thorough a nucleation and growth mechanism. In addition, quasicrystal-like structures were also found in the initial stages of crystallization. The existences of such multiple stable structures based on atomic clusters are probably related to the high glass stabilities in these glasses.

Research Products

• [Journal Article] (2010)
  • Author(s): A. Hirata, Y. Hirotsu, K. Amiya, A. Inoue
  • Journal Title: J. Alloy. Compd. (in press)
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): A. Hirata, Y. Hirotsu, K. Amiya, N. Nishiyama, A. Inoue
  • Journal Title: Phys. Rev. B 80, 140201 Pages: 1-4
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): A. Hirata, Y. Hirotsu, E. Matsubara
  • Journal Title: Intermetallics 17 Pages: 796-801
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): A. Hirata, N. Kawahara, Y. Hirotsu, A. Makino
  • Journal Title: Intermetallics 17 Pages: 186-189
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): A. Hirata, Y. Hirotsu, K. Amiya, A. Inoue
  • Journal Title: Phys. Rev. B 79, 020205R Pages: 1-4
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): A. Hirata, S. Kuboya, Y. Hirotsu, T. G. Nieh
  • Journal Title: J. Alloy. Compd. 483 Pages: 64-69
  • Peer Reviewed
• [Journal Article] (2008)
  • Author(s): A. Hirata, Y. Hirotsu, K. Amiya, A. Inoue
  • Journal Title: Phys. Rev. B 78 Pages: 144205
  • Peer Reviewed
• [Journal Article] (2008)
  • Author(s): A. Hirata, Y. Hirotsu, K. Amiya, N. Nishiyama, A. Inoue
  • Journal Title: Intermetallics 16 Pages: 491-497
  • Peer Reviewed
• [Presentation] Amorphous and Nanostructured Materials (2009)
  • Author(s): A. Hirata, Y. Hirotsu, K. Amiya, A. Inoue
  • Organizer: 16th International Symposium on Metastable
  • Place of Presentation: Beijing, China.
  • Year and Date: 2009-07-08
• [Remarks]
  • URL: http://www.wpi-aimr.tohoku.ac.jp/chen_labo/html-e/personal-Hirata.htm