Moessbauer Study of the Ball Milling Disordering Process of FeAl Intermetallic Compounds
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw (Poland)
- Departament de Fisica Aplicada, Escola Politecnica Superior de Castelldefels, Universitat Politecnica de Catalunya, Avda. del Canal Olimpic s/n, 08860-Castelldefels (Spain)
- Departament de Fisica i Enginyeria Nuclear, ESAB, Universitat Politecnica de Catalunya, Urgell 187, 08036-Barcelona (Spain)
Structural changes during ball milling of ordered Fe50Al50 intermetallic compounds were studied. X-Ray diffraction allowed the computation of a Long Range Order parameter (LRO) which dropped to zero after a short milling time. The initial B2 ordered structure gradually transforms into a disordered BCC structure, with a final crystallite size of about 25 nm. Moessbauer spectroscopy was used for obtaining a Chemical Short Range Order parameter (CSRO). Using a semiempirical n-body noncentral potential a model of the partially disordered B2 structure was built allowing computing the distribution of Quadrupole Splitting during the disordering process. Comparison between experimental and simulated Moessbauer spectra shows a maximum of disorder in the system for 5h milling, related to the highest value of the lattice spacing and the broader quadrupole hyperfine distribution. However, after milling for times longer than 5h, there is a change on the behavior of the experimental data that cannot be explained by the simple disordering process.
- OSTI ID:
- 20722147
- Journal Information:
- AIP Conference Proceedings, Vol. 765, Issue 1; Conference: International symposium on the industrial applications of the Moessbauer effect, Madrid (Spain), 4-8 Oct 2004; Other Information: DOI: 10.1063/1.1923671; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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