Phase Transitions in Al87Ni7Nd6 View Full Text


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Article Info

DATE

2003

AUTHORS

Despina Louca, K. Ahn, A. K. Soper, S. J. Poon, G. J. Shiflet

ABSTRACT

ABSTRACT The local atomic structure of Al 87 Ni 7 Nd 6 amorphous metallic glass was determined upon heating by neutron diffraction and the pair density function (PDF) analysis. Two isotopes of Ni with very different scattering intensities were used ( 58 Ni and 60 Ni) to separate the local environment of the transition metal. A distinct pre-peak observed in reciprocal space arises because of chemical clustering of Ni atoms. With increasing temperature the coherence length of this peak increases indicating an enhancement in atomic clustering. In addition, precipitation of Al metal is first observed at 200 °C with heating. Binary and ternary Al phases form as the temperature increases further to 500 °C although the majority crystalline phase is Al. The local atomic topology at the intermediate temperatures can be represented with a model that is a combination of the atomic structure at room temperature plus Al. More... »

PAGES

mm9.2

References to SciGraph publications

  • 1988-08. Ductile Al-Ni-Zr amorphous alloys with high mechanical strength in JOURNAL OF MATERIALS SCIENCE LETTERS
  • 1990-12. Atomic structure of amorphous Al90FexCe10−x in JOURNAL OF MATERIALS RESEARCH
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1557/proc-806-mm9.2

    DOI

    http://dx.doi.org/10.1557/proc-806-mm9.2

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