Point Defect Study in Fe72Al28 Alloy as a Function of Thermal Treatment by Positron Lifetime Spectroscopy


Article Preview

The defect structure of Fe28Al samples is examined with the Positron Annihilation Lifetime Spectroscopy. The studies are carried out for samples in as-cast state and after heat treatments: annealing for 24 hours at 900°C (or 1050°C) and either slow cooling with furnace or quenching to oil. The PALS spectra are analyzed using two-state trapping model. Only one type of defects is detected. The positron lifetime in these defects (V) suggests that they are quenched-in Fe-monovacancies (VFe). The vacancy concentration strongly depends on the rate of cooling. Besides, V also depends slightly on the rate of cooling of the material. This fact suggests, according to the predictions of latest theoretical calculations, that V is sensitive to the atomic configuration in the nearest neighborhood of VFe, which give hope to estimate the degree of atomic ordering in alloys by the PALS technique.



Edited by:

Radosław Zaleski




J. Kansy et al., "Point Defect Study in Fe72Al28 Alloy as a Function of Thermal Treatment by Positron Lifetime Spectroscopy", Materials Science Forum, Vol. 666, pp. 50-53, 2011

Online since:

December 2010




[1] R. Kerl, J. Wolff, Th. Hehenkamp: Intermetallics Vol. 7 (1999), p.301.

[2] B. Köhler, J. Wolff, M. Franz, A. Broska, Th. Hehenkamp: Intermetallics Vol. 7 (1999), p.269.

[3] J.L. Jordan, S.C. Deevi: Intermetallics Vol. 11 (2003), p.507.

[4] S.M. Kim, D.G. Morris: Acta Materialia Vol. 46, (1998), p.2587.

[5] O. Kubaschewski: Iron-binary phase diagrams. Berlin: Springer (1982), p.5.

[6] H. -E. Schaefer, R. Würschum, M. Šob, T. Žák, W. Z. Yu, W. Eckert and F. Banhart: Phys. Rev. B Vol. 41 (1990 ), p.11869.

[7] A. Broska, J. Wolff, M. Franz, Th. Hehenkamp: Intermetallics Vol. 7 (1999), p.259.

[8] T. Haraguchi, F. Hori, R. Oshima, M. Kogachi: Intermetallics Vol. 9 (2001), p.763.

[9] N. Diego, F. Plazaola, J.A. Jiménez, J. Serna, J. Rio: Acta Materialia Vol. 53 (2005), p.163.

[10] J. Kansy, A. Hanc, L. Pająk and D. Giebel: Physica Status Solidi C Vol. 6, (2009), p.2326.

[11] J. Kansy, A. Hanc, D. Giebel: Nukleonika Vol. 55, (2010), p.21.

[12] O. Melikhova, J. Čížek, J. Kuriplach, I. Procházka, M. Cieslar, A. Anwand and G. Brauer: Intermetallics Vol. 18 (2010), p.592.

DOI: https://doi.org/10.1016/j.intermet.2009.10.013

[13] J Kansy: Nuclear Instruments and Methods in Physics Research A Vol. 374 (1996), p.235.

[14] J Kansy, D Giebel: Journal of Physics, Conference Series in press.

Fetching data from Crossref.
This may take some time to load.