ISSN:
0392-6737
Schlagwort(e):
Kinetics of defect formation and annealing
;
Alloys
;
Mössbauer effect
;
other γ-ray spectroscopy
;
Conference proceedings
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Summary Point defects in annealed B2-phase FeAl samples in the range 47–53 at.% Fe were studied using57Fe Mössbauer spectroscopy. Spectra were analyzed using local environment models according to which point defects in atomic shells close to probe atoms induce shifts in the nuclear monopole interaction. For well-annealed samples, better results were obtained assuming only the presence of FeAl antisite and VFe vacancy defects, and not of AlFe antisite defects. Monopole interactions of57Fe probes on the Fe and Al sublattices having no defects in the first two shells were about +0.27 and −0.03 mm s−1, respectively, with respect to Fe in alpha-Fe metal. The shifts induced by FeAl and VFe defects in the first shells of Fe probes on the Fe and Al sublattices were −0.15 and −0.24 mm s−1, respectively, and, in the second shells, +0.06 and +0.011 mm s−1. In addition to structural defects needed to accommodate deviations from stoichiometry, annealed samples were found to contain several percents of FeAl and VFe defects due to lattice disorder, with greater disorder in Fe-deficient alloys.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02458913
