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Correlation between microstructural evolution during high-pressure torsion and isothermal heat treatment of amorphous Al85Gd8Ni5Co2 alloy

Published online by Cambridge University Press:  31 January 2011

Péter Henits ,
Ádám Révész ,
Erhard Schafler ,
Péter J. Szabó ,
János L. Lábár ,
Lajos K. Varga  and
Zsolt Kovács
Ádám Révész*
Affiliation:
Department of Materials Physics, Eötvös University, Budapest, H-1518 Hungary
Erhard Schafler
Affiliation:
Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, A-1090 Vienna, Austria
Péter J. Szabó
Affiliation:
Department of Materials Science and Engineering, University of Technology and Economy, Budapest, H-1111 Hungary
János L. Lábár
Affiliation:
Research Institute for Technical Physics and Material Science, Hungarian Academy of Sciences, Budapest, H-1121 Hungary
Lajos K. Varga
Affiliation:
Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Budapest, H-1525 Hungary
Zsolt Kovács
Affiliation:
Department of Materials Physics, Eötvös University, Budapest, H-1518 Hungary
*
a)Address all correspondence to this author. e-mail: reveszadam@ludens.elte.hu
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Abstract

Al85Gd8Ni5Co2 metallic glass was subjected to partial devitrification by high-pressure torsion, continuous heat treatment, and isothermal annealing. The fully amorphous alloy exhibits a well-defined transition in its first devitrification product during isothermal heat treatments from τm + α-Al phase mixture to primary α-Al by increasing the annealing temperature above 555 K. This thermal sensitivity predestinates the composition to identify the controversial thermal contribution of the plastic deformation in metallic glasses. Thermal stability and structure of the partially devitrified samples were systematically analyzed and compared by calorimetry, x-ray diffraction, and electron microscopy. It seems that the effect of severe deformation cannot be singled out by a simple isothermal heat treatment; i.e., high-pressure torsion acts as a spectrum of heat treatments performed at different annealing temperatures.

Keywords

AmorphousCalorimetryNucleation & growth
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 7 , July 2010 , pp. 1388 - 1397
Copyright
Copyright © Materials Research Society 2010

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