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Glass and Quasicrystal Formation in a Zr-based Multicomponent Alloy

Published online by Cambridge University Press:  17 March 2011

U. Kühn ,
J. Eckert ,
N. Mattern  and
L. Schultz
U. Kühn
Affiliation:
IFW Dresden, P.O.Box 270016, D-01171 Dresden, Germany
J. Eckert
Affiliation:
IFW Dresden, P.O.Box 270016, D-01171 Dresden, Germany
N. Mattern
Affiliation:
IFW Dresden, P.O.Box 270016, D-01171 Dresden, Germany
L. Schultz
Affiliation:
IFW Dresden, P.O.Box 270016, D-01171 Dresden, Germany
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Abstract

The phase formation of a Zr57Ti8Nb2.5Cu13.9Ni11.1Al7.5alloy has been investigated upon cooling from the melt at different quenching rates as well as upon annealing of as-cast specimens. The different samples are characterized by x-ray diffraction, transmission electron microscopy and differential scanning calorimetry. Rapid quenching using the melt spinning technique results in amorphization. Slower cooling as realized upon copper mold casting leads to an icosaheadral quasicrystalline phase coexisting with a small amount of amorphous phase. The primarily formed quasicrystals have a grain size of about 1 νm. Upon annealing, the amorphous phase formed upon melt spinning precipitates quasicrystals in the first step of a series of transformations to the crystalline equilibrium compounds. The quasicrystals formed by annealing do not exceed a size of 5 to 10 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L12.8
Copyright
Copyright © Materials Research Society 2001

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