Abstract
AbstractQuenched‐in vacancies in Fe3Al‐based intermetallics were studied in this work. A stoichiometric Fe3Al alloy was compared with non‐stoichiometric specimens either with a deficiency or with an excess in Al content. Vacancies in specimens quenched from the disordered A2 phase were investigated by three independent techniques of positron annihilation spectroscopy: positron lifetime (LT) studies, slow positron implantation spectroscopy (SPIS) with a continuous slow positron beam, and coincidence Doppler broadening (CDB). It was found that the combination of LT and SPIS enables to determine reliably even very high concentrations of vacancies. Infor‐mation about the local chemical environment of quenched‐in vacancies was obtained from CDB measurements. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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