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Amorphization and thermal stability of mechanically alloyed Zr54Cu19Ni8Al8Si5Ti5O1

Published online by Cambridge University Press:  26 February 2011

Vassilios Kapaklis ,
Athanasios Georgiopoulos ,
Peter Schweiss  and
Constantin Politis
Vassilios Kapaklis
Affiliation:
[email protected], University of Patras, Engineering Science Department (B' Ktirio), School of Engineering, Patras, Achaia, 26500, Greece, +30 2610 997830, +30 2610 997255
Athanasios Georgiopoulos
Affiliation:
[email protected], University of Patras, Materials Science Department, Greece
Peter Schweiss
Affiliation:
[email protected], Forschungszentrum Karlsruhe, Institut für Festkörperphysik, Germany
Constantin Politis
Affiliation:
[email protected], University of Patras, Engineering Science Department, Greece
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Abstract

In the present work we have intentionally introduced significant amount of oxygen to Zr- based alloys. Samples were prepared either by high energy ball milling of the elemental powders and single phase α-ZrO0.43 at the appropriate stoichiometry, or by melting in an Zr-gettered arc melting facility, in both cases under purified argon atmosphere. The effect of small amounts of oxygen (∼1 at. %) on the amorphization process and the thermal stability of mechanically alloyed Zr54Cu19Ni8Al8Si5Ti5O1 powders and arc melted bulk samples was studied by X-ray diffraction and differential scanning calorimetry. It was found that the introduction of oxygen to the alloy composition does not inhibit the amorphization but enhances greatly the thermal stability of the mechanically alloyed amorphous powders. Compared to samples without oxygen prepared either by arc melting or mechanical alloying, samples with oxygen show an increase of the supercooled liquid region from ΔTx−g=Tx−Tg=117 °C to 141 °C where Tx is the crystallization and Tg the glass transition temperature. The glass transition for the mechanically alloyed samples (Tgma) remains unaffected at 336 °C.

Keywords

amorphousmechanical alloyingO
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 903: Symposium Z – Amorphous and Nanocrystalline Metals for Structural Applications , 2005 , 0903-Z05-26
Copyright
Copyright © Materials Research Society 2006

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