Local atomic structure of Pd-Ni-P bulk metallic glass examined by high-resolution electron microscopy and electron diffraction

Akihiko Hirata, Yoshihiko Hirotsu, Tadakatsu Ohkubo, Nobuo Tanaka, T. G. Nieh

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Structural fluctuation in a Pd40Ni40P20 bulk metallic glass is investigated by transmission electron microscopy and electron diffraction. Local atomic ordered regions with a fcc-(Pd,Ni) type structure was sharply imaged by a high-resolution electron microscopy (HREM) attached with a Cs-corrector. Interference function for the glassy state was obtained from electron-diffraction intensity profiles using energy-filter and imaging-plate techniques. We used a reverse Monte Carlo (RMC) simulation method to develop a realistic structure model. The model consists of a dense-random-packing structure, in which an fcc ordered region with Pd, Ni, and P atoms was embedded. The structure model is consistent with the diffraction and HREM results. In Voronoi polyhedral analysis of the RMC simulated structure, P-centered (Pd,Ni)-P trigonal prisms are found primarily in the matrix structure embedding the fcc-cluster. Around Pd and Ni atoms deformed-fcc type polyhedra were frequently observed. From these local structural features, nanoscale phase separation was revealed to occur during the glass formation.

Original languageEnglish
Pages (from-to)903-907
Number of pages5
JournalIntermetallics
Volume14
Issue number8-9
DOIs
Publication statusPublished - 2006 Aug 1
Externally publishedYes

Fingerprint

High resolution electron microscopy
Metallic glass
Model structures
Electron diffraction
Atoms
Prisms
Phase separation
Diffraction
Transmission electron microscopy
Imaging techniques
Glass
Monte Carlo simulation

Keywords

  • B. Glasses, metallic
  • F. Diffraction
  • F. Electron microscopy, transmission

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Local atomic structure of Pd-Ni-P bulk metallic glass examined by high-resolution electron microscopy and electron diffraction. / Hirata, Akihiko; Hirotsu, Yoshihiko; Ohkubo, Tadakatsu; Tanaka, Nobuo; Nieh, T. G.

In: Intermetallics, Vol. 14, No. 8-9, 01.08.2006, p. 903-907.

Research output: Contribution to journalArticle

Hirata, Akihiko ; Hirotsu, Yoshihiko ; Ohkubo, Tadakatsu ; Tanaka, Nobuo ; Nieh, T. G. / Local atomic structure of Pd-Ni-P bulk metallic glass examined by high-resolution electron microscopy and electron diffraction. In: Intermetallics. 2006 ; Vol. 14, No. 8-9. pp. 903-907.
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AU - Nieh, T. G.

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