Disordering and reordering kinetics of a Fe-40Al B2 alloy
- Univ. di Trento (Italy). Dipt. di Ingegneria dei Materiali
- Univ. Autonoma de Barcelona, Bellaterra (Spain). Dept. de Fisica
The ordered structure of Fe-40Al 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 they 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. They followed the kinetics of the disorder to order transformation by Differential Scanning Calorimetry and Thermogravimetric Magnetic Measurements. The two techniques allowed them 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.
- OSTI ID:
- 78323
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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