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Metastable States During Devitrification of a Zr70Pd20Cu10 Metallic Glass

Published online by Cambridge University Press:  01 February 2011

M. J. Kramer  and
D. J. Sordelet
M. J. Kramer
Affiliation:
Metal and Ceramic Sciences Program, Ames Laboratory (USDOE) Department of Materials Science and Engineering, Iowa State University Iowa State University Ames, Iowa 50011–3020, USA
D. J. Sordelet
Affiliation:
Metal and Ceramic Sciences Program, Ames Laboratory (USDOE) Department of Materials Science and Engineering, Iowa State University Iowa State University Ames, Iowa 50011–3020, USA
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Abstract

High energy synchrotron x-rays (124.63 keV) are used to investigate the initial stages of the devitrification for the Zr70Pd20Cu10 metallic glass prepared by melt-spinning (MS). Due to the excellent signal:noise, we are able to determine the initial nucleating phase by analyzing the differences in the total scattering function S (Q) as a function of time at a temperature ∼ 50 K below the crystallization temperature. The alloy undergoes a structural relaxation prior to nucleation and growth. Devitrification proceeds from nucleation of the icosahedral phase. The differential pair distribution function (dPDF) indicates that the as-quenched alloy may have icosahedral-like order which undergoes local rearrangement to true icosahedral order at an annealing temperature 50 K below the crystallization temperature. More importantly, time-resolved high-energy synchrotron is shown to have excellent sensitivity to the initial atomic rearrangements preceding nucleation in metallic glasses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003 , MM4.6/LL6.6
Copyright
Copyright © Materials Research Society 2004

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References

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