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Disordering and Reordering Kinetics of a Fe–40A1 B2 Alloy

Published online by Cambridge University Press:  22 February 2011

S. Gialanella ,
M. D. Baró ,
L. Lutterotti  and
S. Suriñach
S. Gialanella
Affiliation:
Dipartimento di Ingegneria dei Materiali, Universita di Trento, 38050, Trento Italy;
M. D. Baró
Affiliation:
Departament de Fisica, Universitat Autonoma de Barcelona, 08193, Bellaterra, Spain.
L. Lutterotti
Affiliation:
Dipartimento di Ingegneria dei Materiali, Universita di Trento, 38050, Trento Italy;
S. Suriñach
Affiliation:
Departament de Fisica, Universitat Autonoma de Barcelona, 08193, Bellaterra, Spain.
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Abstract

The ordered structure of Fe–40A1 B2 powders was completely disordered by high energy ball-milling. The defect structures of the powders disordered to different extents were characterized using X-Ray diffraction. A significant lattice expansion was observed, which we tried to relate to the high concentration of point defects introduced into the material as a consequence of milling.

A complete reordering was accomplished by heating up the specimens under an inert Ar atmosphere. We followed the kinetics of the disorder to order transformation by Differential Scanning Calorimetry and Thermogravimetric Magnetic Measurements. The two techniques allowed us to identify the temperature range and the apparent activation energy of the process. As expected, a decrease in the magnetic moment of the originally disordered powders as a consequence of the reordering treatments was also observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 213
Copyright
Copyright © Materials Research Society 1995

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