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Annealing-induced phase transitions in a Zr–Ti–Nb–Cu–Ni–Al bulk metallic glass matrix composite containing quasicrystalline precipitates

  • Uta Kühn EMAIL logo , Jürgen Eckert and Ludwig Schultz
Published/Copyright: February 12, 2022
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Abstract

The phase formation of a copper-mold-cast Zr60Ti2Nb6Cu14 Ni9Al9 alloy has been investigated upon cooling from the melt as well as upon annealing of as-cast specimens. The different states of the samples are characterized by X-ray diffraction, optical and electron microscopy, and differential scanning calorimetry. The cooling rate as realized upon copper-mold casting leads to micrometer-sized quasicrystals, which are embedded in a glassy phase. The thermal stability ΔTx of the supercooled liquid state of the glassy phase that forms near to the wall of the copper mold, differs from that of the glassy matrix in the center of the rod due to different compositions of the glassy phase. This is a consequence of the change in local cooling conditions, which affects the phase formation upon solidification as well as the subsequent transformation behavior of the alloy upon constant-rate heating.


Dedicated to Professor Dr. Knut Urban on the occasion of his 65th birthday



Dr. Uta Kühn Leibniz-Institut für Festkörper- und Werkstoffforschung IFW Dresden Postfach 27 00 16, D-01171 Dresden, Germany Tel.: +49 351 4659 402 Fax: +49 351 4659 541

Funding statement: The authors would like to thank B. Bartusch, M. Frey, H. Kempe, J. Kühn, B. Opitz, and H. Schulze for technical assistance, W. Gruner, and V. Michel for chemical analysis, and N. Mattern and S. Scudino for helpful discussions

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Received: 2005-12-27
Accepted: 2006-02-26
Published Online: 2022-02-12

© 2006 Carl Hanser Verlag, München

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