High-resolution positron lifetime spectroscopy and slow positron implantation spectroscopy were used to characterize defects in Fe75.99Al24.01 and Fe71.98Al28.02 alloys. In order to facilitate defect identification, a theoretical study was also made of basic vacancy-like defects in three phases of the Fe3Al system: ordered (D03), short-range ordered (B2) and disordered (A2). Positron characteristics, i.e. positron lifetime and positron binding energy to defects were calculated from first-principles for various defect configurations.

Quenched-In Vacancies in Fe3Al Based Alloys: a Positron Annihilation Study. O.Melikhova, J.Čížek, J.Kuriplach, I.Procházka, F.Lukáč, M.Cieslar, W.Anwand, G.Brauer: Journal of Physics - Conference Series, 2011, 265[1], 012016