Nanostructure controlling in Zr-based metallic glasses using icosahedral local structure
DOI: 10.1016/j.jallcom.2008.07.182
Title: Nanostructure controlling in Zr-based metallic glasses using icosahedral local structure
Journal Title: Journal of Alloys and Compounds
Volume: 483
Publication Date: 26 August 2009
Start Page: 231
End Page: 234
Published online: online 6 December 2008
ISSN: 0925-8388
Affiliations:

  • a Center for Interdisciplinary Research, Tohoku University, Sendai, Japan

  • b Institute for Materials Research, Tohoku University, Sendai, Japan

  • c Department of Environmental Studies, Tohoku University, Sendai, Japan

  • d Tohoku University, Sendai, Japan
  • Abstract: no(quasi)crystal composite materials based on Zr–Al–Ni–Cu metallic glasses have been synthesized by controlling the nucleation and growth rates of the precipitated phase correlated with a unique icosahedral local structure. It is well known that the Zr65Al7.5Ni10Cu17.5 metallic glass has a high glass-forming ability (GFA), which enables us to produce the glassy sample with a bulky shape. controlling a substitution of QC-forming elements such as noble metals with Cu and annealing condition, the nanoscale icosahedral quasicrystalline phase (I-phase) with various grain sizes and nucleus densities can be formed. Moreover, we have succeeded to control the nano-QC phase nucleation by changing the atmosphere pressure during casting, which results in the formation of new bulk metallic glasses (BMGs). These nanoscale structure and nucleation controlling techniques in BMGs bring a significant improvement of mechanical properties such as high strength and good ductility.
    Accepted: 28 July 2008
    Received: 30 August 2007
    Revised: 19 July 2008
    Keywords: Metallic glasses; Nano-composite; Icosahedral local structure; Mechanical property; Quasicrystal
    Tel: +81 22 795 5752
    Fax: +81 22 795 5756
    Email: jsaida@cir.tohoku.ac.jp

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