PL EN


Preferences help
enabled [disable] Abstract
Number of results
2008 | 113 | 5 | 1409-1415
Article title

Vacancy Formation in Fe-Al of B2 and DO_3 Alloys

Content
Title variants
Languages of publication
EN
Abstracts
EN
The positron lifetime spectroscopy is employed to study vacancy formation in intermetallic phases of DO_3 and B2 structures from Fe-Al system as a function of Al concentration, ternary additive (Cr) and their thermal treatment. Lifetime spectra were fitted en block by a simple trapping model encoded directly to the software (computer program LT-9). In the investigated range of Al concentration (28, 38, 42, and 45 at%) only two types of defects are found. In DO_3 region a single type of defects (characterized by positron lifetime τ_1=170±2 ps) is detected and indicated as vacancies in the Fe sublattice (V_{Fe}). In B2 region a small amount of an additional type of defects (characterized by positron lifetime τ_2=214±13 ps) appears. Supposedly, these are vacancies in Al sublattice (V_{Al}). For Fe28Al and Fe28Al5Cr samples changes in V_{Fe} concentration are determined as a function of the sample composition, annealing time at 1000°C and quenching the samples to air and oil. The defect concentration increases with increase in Al content. For FeAl with Al above 38 at%, the total concentration of defects is so high that positrons are exclusively trapped by defects. Therefore the concentrations V_{Al} and V_{Fe} cannot be determined separately. However, the ratio of V_{Al} concentration to V_{Fe} concentration is estimated as a function of Al content.
Keywords
EN
Contributors
author
  • Institute of Materials Science, University of Silesia, Bankowa 12, 40-007 Katowice, Poland
author
  • Institute of Materials Science, University of Silesia, Bankowa 12, 40-007 Katowice, Poland
author
  • Institute of Materials Science, University of Silesia, Bankowa 12, 40-007 Katowice, Poland
  • Institute of Materials Science, Silesian Technical University, Krasińskiego 8, 40-019 Katowice, Poland
References
  • 1. J.L. Jordan, S.C. Deevi, Intermetallics 11, 507 (2003)
  • 2. D.G. Morris, M.A. Morris-Mudoz, Intermetallics 7, 1121 (1999)
  • 3. B. Bergson, M.J. Stott, Solid State Commun. 7, 1023 (1930)
  • 4. D.C. Conners, R.N. West, Phys. Lett. A 30, 24 (1969)
  • 5. M. Kogachi, T. Haraguchi, S.M. Kim, Intermetallics 6, 30 (1924) 69
  • 6. M. Hillert, M. Selleby, J. Alloys Comp. 329, 208 (2001)
  • 7. S. Gialanella, R.S. Brusa, W. Deng, F. Marino, T. Spataru, G. Principi, J. Alloys Comp. 317-318, 485 (2001)
  • 8. J. Bogner, W. Steiner, M. Reissner, P. Mohn, P. Blaha, K. Schwarz, R. Krachler, H. Ipser, B. Sepiol, Phys. Rev. B 58, 14922 (1998)
  • 9. A. Broska, J. Wolff, M. Franz, Th. Hehenkamp, Intermetallics 7, 259 (1999)
  • 10. X. Ren, K. Otsuka, Philos. Mag. A 80, 467 (1900)
  • 11. T. Haraguchi, M. Kogachi, S.M. Kim, Intermetallics 7, 981 (1999)
  • 12. A. Hanc, G. Dercz, J. E. Frc ackowiak L. Pająk, F. Binczyk, in: Proc. XIX Conf. on Applied Crystallography, Eds. H. Morawiec, D. Stróż, World Scientific, Singapore 2004, p. 312
  • 13. A. Hanc, J.E. Frc ackowiak, Nukleonika 49, S3, 7 (2004)
  • 14. J. Kansy, in: Proc. 34th Polish Seminar on Positron Annihilation, Ed. K. Jerie, Turawa 2002, p. 179, in 'Help' of the LT-9 computer program
  • 15. J. Kansy, Nucl. Instrum. Methods Phys. Res. A 374, 235 (1996)
  • 16. B. Bergson, M.J. Stott, Solid State Commun. 7, 1023 (1963)
  • 17. D.C. Conners, R.N. West, Phys. Lett. A 30, 24 (1969)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv113n518kz
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.