MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Ab-Initio Data for Interatomic Interactions in Zr-Rich ZrX (X=Sc-Cu) Alloys and Stability of Icosahedron-Like Zr13−nCun (n=3, 4) Clusters in Zr70Cu30 Metallic Glass
N. FujimaM. AsatoR. TamuraT. Hoshino
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2007 Volume 48 Issue 7 Pages 1734-1738

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Abstract

We give ab-initio data for the study of the stability of the atomic structures of Zr-rich ZrX (X=Sc-Cu) alloys, such as the cohesive energies and equilibrium Wigner-Seitz radii of elemental metals X (X=Sc-Cu, Zr-Ag) and X-X (X=Sc-Cu) interaction energies in Zr. The calculations are based on the density functional thoery in the generalized gradient approximation and employ the full-potential Korringa-Kohn-Rostoker Green’s function method. Using the calculated results, we elucidate the fundamental features of interatomic interactions of Zr-rich ZrX alloys. Especially, we found that the pair interaction of Cu impurities in Zr becomes strongly attractive around the interatomic distance of 0.45∼0.46 nm. It is shown that this interaction may be important for the stability of icosahedron-like local atomic structures of Zr10Cu3 and Zr9Cu4 clusters in the Zr70Cu30 bulk metallic glass, being proposed experimentally. We also found that the atomic structure of an isolated Zr10X3 cluster transforms from the hcp structure (initial state) to an icosahedron-like structure (final state) for X=Cu, but not for X=Ni.

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© 2007 The Japan Institute of Metals and Materials
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