Defect structures in FeAl b2 alloys

Two alloys of the Fe-Al system, having compositions in the B2 phase stabili ty range, have been investigated concerning the kinds and concentrations of the lattice defects that can be frozen into the material by water quenchin g from temperatures as high as 1000 degreesC. The specimens were characteri sed using positron annihilation methods, Mossbauer spectroscopy and X-ray d iffraction. The values of the positron lifetimes indicate that lattice defe cts in the samples quenched from lower temperatures are different from thos e found in specimens treated at higher temperatures. The overall picture on the actual type and concentration of such defects, as also obtained from t he other analytical techniques, is consistent with the literature data on s imilar alloys. (C) 2001 Elsevier Science B.V. All rights reserved.