Defect structures in FeAl B2 alloys

摘要

Two alloys of the Fe-Al system, having compositions in the B2 phase stability range, have been investigated concerning the kinds and concentrations of the lattice defects that can be frozen into the material by water quenching from temperatures as high as 1000 deg C. The specimens were characterised using positron annihilation methods, Mossbauer spectroscopy and X-ray diffraction. The values of the positron lifetimes indicate that lattice defects in the samples quenched from lower temperatures are different from those found in specimens treated at higher temperatures. The overall picture on the actual type and concentration of such defects, as also obtained from the other analytical techniques, is consistent with the literature data on similar alloys.