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Structural changes and physical properties of Fe–Ni-based metallic glasses rapidly heated by pulsed electrical currents

Published online by Cambridge University Press:  31 January 2011

L. Zaluski ,
A. Zaluska ,
M. Kopcewicz  and
R. Schulz
L. Zaluski
Affiliation:
Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
A. Zaluska
Affiliation:
Institute of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
M. Kopcewicz
Affiliation:
Institute of Experimental Physics, Warsaw University, Warsaw, Poland
R. Schulz
Affiliation:
Hydro-Quebec Research Institute, Varennes, Quebec, Canada, J3X 1S1
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Abstract

Fe–Ni–Si–B metallic glasses have been annealed and crystallized using short electrical current pulses. Two types of electrical heat treatment have been used. The first one is an isothermal annealing treatment using a very high initial heating rate while the second one is a thermal spike applied on an amorphous sample held at various initial temperatures. The microstructure of the alloys after heat treatment has been characterized by x-ray diffraction, transmission electron microscopy, and Mössbauer spectroscopy. The thermal and magnetic properties of the samples measured by DSC and hysteresis loop tracer have been studied after the various heat treatments and correlated with the microstructure of the alloys. The crystallization at high temperatures produces the gamma phase only, while at low temperatures, a mixture of the gamma and alpha phases (the alpha phase being predominant) is usually observed. The samples initially held at liquid nitrogen temperature and heat treated with a thermal spike remain amorphous and show improved magnetic properties (lower coercive field and higher induction at saturation) without loss of ductility.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 5 , May 1991 , pp. 1028 - 1034
Copyright
Copyright © Materials Research Society 1991

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