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Effect of Al and Ag addition on phase formation, thermal stability, and mechanical properties of Cu–Zr-based bulk metallic glasses

Published online by Cambridge University Press:  27 April 2011

Nilam Barekar ,
Piter Gargarella ,
Kaikai Song ,
Simon Pauly ,
Uta Kühn  and
Jürgen Eckert
Nilam Barekar*
Affiliation:
IFW Dresden, Institut für Komplexe Materialien, D-01069 Dresden, Germany
Piter Gargarella
Affiliation:
IFW Dresden, Institut für Komplexe Materialien, D-01069 Dresden, Germany
Kaikai Song
Affiliation:
IFW Dresden, Institut für Komplexe Materialien, D-01069 Dresden, Germany
Simon Pauly
Affiliation:
IFW Dresden, Institut für Komplexe Materialien, D-01069 Dresden, Germany
Uta Kühn
Affiliation:
IFW Dresden, Institut für Komplexe Materialien, D-01069 Dresden, Germany
Jürgen Eckert
Affiliation:
IFW Dresden, Institut für Komplexe Materialien, D-01069 Dresden, Germany; and TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany
*
a)Address all correspondence to this author. e-mail: n_barekar@yahoo.co.in
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Abstract

The compositional dependence of phase formation, thermal stability, and mechanical properties of (Cu0.5Zr0.5)100−x(Al0.5Ag0.5)x (x = 2, 4, 6, 8, 10, 12, 14, 16) bulk metallic glasses was studied. The Young’s modulus (85 ± 1 to 95 ± 1 GPa) and Vicker’s hardness (585 ± 7 to 627 ± 8 Hv) increased with increasing Al + Ag content from 8 to 16 at.%, respectively. The liquidus temperature decreased from 1210 ± 2 to 1110 ± 2 K with increasing Al + Ag content from 2 to 16 at.%. The starting temperature of the endothermic event related with transformation of the low-temperature equilibrium phases to CuZr parent phase increased from 997 ± 2 to 1043 ± 2 K, whereas the electronegativity difference for the (Cu0.5Zr0.5)100−x(Al0.5Ag0.5)x (x = 2, 4, 6, 8, 10, 12) alloys decreased from 0.2838 to 0.2713. The martensitic transformation temperatures decreased with increasing Al and Ag content for the (Cu0.5Zr0.5)100−x(Al0.5Ag0.5)x (x = 2, 4, 6, 8) alloys.

Keywords

AmorphousPhase transformationElectronic structure

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Type
Articles
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Journal of Materials Research , Volume 26 , Issue 14 , 28 July 2011 , pp. 1702 - 1710
Copyright
Copyright © Materials Research Society 2011

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