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Local Order in Amorphous Fe-alloys

Published online by Cambridge University Press:  11 February 2011

Despina Louca ,
Kyungsoo Ahn ,
V. Ponnambalam  and
S. J. Poon
Despina Louca
Affiliation:
University of Virginia, Dept. of Physics, Charlottesville, VA 22904.
Kyungsoo Ahn
Affiliation:
University of Virginia, Dept. of Physics, Charlottesville, VA 22904.
V. Ponnambalam
Affiliation:
University of Virginia, Dept. of Physics, Charlottesville, VA 22904.
S. J. Poon
Affiliation:
University of Virginia, Dept. of Physics, Charlottesville, VA 22904.
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Abstract

The pair density function analysis of neutron diffraction data of Fe-based metallic glasses of the Zr and Mo series shows how the local atomic structure changes by chemical substitution. The results provide evidence for short-range chemical reorganization accompanied by a volume contraction that could in turn be associated with stronger glass forming ability. While the existence of chemical short-range topological ordering is enhanced in both systems by alloying with a transition metal such as Mn, locally, the atomic structure changes in a way that corresponds to an increase in bonding interactions. The shortening of bonds is also related to volume contraction that can in turn be associated with a reduction of the ferromagnetic coupling of the Fe sublattice and to a lower Curie transition temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC7.7
Copyright
Copyright © Materials Research Society 2003

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References

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