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Interdiffusion reaction, phase sequence, and glass formation in Ni-Zr composites

Published online by Cambridge University Press:  31 January 2011

J. Eckert ,
L. Schultz  and
K. Urban
J. Eckert
Affiliation:
Siemens AG, Research Laboratories, D-8520 Erlangen, Germany
L. Schultz
Affiliation:
Siemens AG, Research Laboratories, D-8520 Erlangen, Germany
K. Urban
Affiliation:
KFA Jülich, Institut für Festkörperforschung, D-5170 Jülich, Germany
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Abstract

The progress of solid-state reaction in Ni–Zr composite wires with different elemental layer thicknesses has been studied in detail. Besides x-ray diffraction and differential scanning calorimetry, dilatometric measurements, magnetization and resistivity measurements, and cross–sectional transmission electron microscopy were used to monitor the reaction during constant-rate heating and to characterize the various reaction products. An amorphous phase initially forms at the interface between the elemental layers. As soon as the layer thickness exceeds a critical value, the intermetallic NiZr phase appears at the interface between the amorphous phase and pure Zr, as shown by TEM investigations. This is due to a reduced velocity of the reaction front caused by the longer diffusion path enabling the intermetallic phase to become stable. As shown in experiments at a constant heating rate, a second intermetallic phase forms at higher temperatures at the interface between Zr and crystalline NiZr. The amorphous phase remains unchanged up to crystallization at about 520 °C. To obtain fully amorphous material, the interdiffusion reaction must be completed (or especially the Zr layers must be completely reacted) before the intermetallic NiZr phase starts to form. A criterion for achieving completely amorphous bulk material is derived.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 9 , September 1991 , pp. 1874 - 1885
Copyright
Copyright © Materials Research Society 1991

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