Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationQuenched-in vacancies in Fe-Al alloys
Melikhova, O.; Cizek, J.; Lukac, F.; Procházka, I.; Kuriplach, J.; Anwand, W.; Brauer, G.
Abstract
Quenched-in vacancies in Fe-Al alloys with Al content ranging from 24 to 49 at.% were investigated employing two complementary techniques of positron annihilation: slow positron implantation spectroscopy and positron lifetime measurements. It was found that quenched alloys exhibit a very high concentration of vacancies. Although the free positron component cannot be resolved in positron lifetime spectrum in majority of samples, the concentration of quenched-in vacancies can be still determined from the positron diffusion length measured by a variable energy positron beam. The lowest concentration of vacancies was found in a stoichiometric (SM) Fe3Al alloy. The concentration of defects increases with increasing degree of non-stoichiometry with respect to Fe3Al, i.e. in alloys with under-SM and over-SM Al concentration. However, the increase in concentration of quenched-in defects is more pronounced in Al-rich alloys, i.e. alloys containing more than 25 at.% of Al.
Involved research facilities
- P-ELBE
-
Journal of Physics: Conference Series 262(2011), 012039
DOI: 10.1088/1742-6596/262/1/012039
Permalink: https://www.hzdr.de/publications/Publ-15204
Years: 2023 2022 2021 2020 2019 2018 2017 2016 2015