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Nanocrystallization of gas atomized Cu47Ti33Zr11Ni8Si1 metallic glass

Published online by Cambridge University Press:  01 March 2006

S. Venkataraman ,
S. Scudino ,
J. Eckert ,
T. Gemming ,
C. Mickel ,
L. Schultz  and
D.J. Sordelet
S. Venkataraman*
Affiliation:
Leibniz-Institut für Festkörper- und Werkstofforschung Dresden (IFW) Dresden, Institut für Metallische Werkstoffe, D-01171 Dresden, Germany
S. Scudino
Affiliation:
Leibniz-Institut für Festkörper- und Werkstofforschung Dresden (IFW) Dresden, Institut für Metallische Werkstoffe, D-01171 Dresden, Germany
J. Eckert
Affiliation:
Fachgebiet (FG) Physikalische Metallkunde, Fachbereich (FB) 11 Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany; and Leibniz-Institut für Festkörper- und Werkstofforschung Dresden (IFW) Dresden, Institut für Metallische Werkstoffe, D-01171 Dresden, Germany
T. Gemming
Affiliation:
Leibniz-Institut für Festkörper- und Werkstofforschung Dresden (IFW) Dresden, Institut für Festkörperanalytik und Strukturforschung, D-01171 Dresden, Germany
C. Mickel
Affiliation:
Leibniz-Institut für Festkörper- und Werkstofforschung Dresden (IFW) Dresden, Institut für Metallische Werkstoffe, D-01171 Dresden, Germany
L. Schultz
Affiliation:
Leibniz-Institut für Festkörper- und Werkstofforschung Dresden (IFW) Dresden, Institut für Metallische Werkstoffe, D-01171 Dresden, Germany
D.J. Sordelet
Affiliation:
Material and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50014; and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50014
*
a) Address all correspondence to this author. e-mail: s.venkataraman@phm.tu-darmstadt.de
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Abstract

Cu47Ti33Zr11Ni8Si1 metallic glass powder was prepared by gas atomization. Decomposition in the amorphous alloy and primary crystallization has been studied by differential scanning calorimetry (DSC), x-ray diffraction (XRD), and transmission electron microscopy (TEM). The glassy powder exhibits a broad DSC exotherm prior to bulk crystallization. Controlled annealing experiments reveal that this exotherm corresponds to a combination of structural relaxation and nanocrystallization. A uniform featureless amorphous contrast is observed in the TEM prior to the detection of nanocrystals of 4–6 nm in size. High-resolution TEM studies indicate that this nanocrystalline phase has a close crystallographic relationship with the γ–CuTi phase having a tetragonal structure. The product of the main crystallization event is also nanocrystalline, hexagonal Cu51Zr14, having dimensions of 20 nm. However, there is no evidence for possible amorphous phase separation prior to the nanocrystallization events.

Keywords

CalorimetrySiTransmission electron microscopy (TEM)

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Type
Articles
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Journal of Materials Research , Volume 21 , Issue 3 , March 2006 , pp. 597 - 607
Copyright
Copyright © Materials Research Society 2006

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References

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