Formation of the icosahedral quasicrystalline phase in Zr70Pd30 binary glassy alloy

Citation
J. Saida et al., Formation of the icosahedral quasicrystalline phase in Zr70Pd30 binary glassy alloy, PHIL MAG L, 81(1), 2001, pp. 39-44
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHILOSOPHICAL MAGAZINE LETTERS
ISSN journal
0950-0839 → ACNP
Volume
81
Issue
1
Year of publication
2001
Pages
39 - 44
Database
ISI
SICI code
0950-0839(200101)81:1<39:FOTIQP>2.0.ZU;2-7
Abstract
It is found that a single icosahedral quasicrystalline phase is formed as a primary precipitation phase in the melt-spun Zr70Pd30 binary glassy alloy with a two-stage crystallization process. The onset temperature of the tran sformation from the amorphous to the icosahedral phase is 701 K at the heat ing rate of 0.67 K s(1). The size of the icosahedral particles lies in the diameter range below 10 nm and the particles are distributed homogeneously. The second-stage crystallization reaction results in the formation of a Zr 2Pd phase through a single exothermic reaction. The formation of the nanosc ale icosahedral phase indicates the possibility that icosahedral short-rang e order exists in the Zr-Pd binary glassy state. Comparison with the therma l stability of an icosahedral phase in the Zr-Ni-Pd system shows that the i cosahedral phase is stabilized by the addition of Ni. The stabilization is due to the restraint of the long-range rearrangement of the constitutional elements resulting from the strong chemical affinity between Zr and Ni.