A positron study of the defect structures in the D0{sub 3} and B2 phases in the Fe-Al system

Journal Article · Mon Jan 03 00:00:00 EST 2005 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2004.09.013· OSTI ID:20637112

Diego, N de ^[1]; Plazaola, F ^[2]; Jimenez, J A ^[3]; Serna, J ^[1]; Rio, J del ^[1]

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1. Departamento de Fisica de Materiales, Facultad de Ciencias Fisicas, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid (Spain)
2. Elektrika eta Elektronika Saila, Zientzi Fakultatea, UPV-EHU, 48080 Bilbao (Spain)
3. Centro Nacional de Investigaciones Metalurgicas, Consejo Superior de Investigaciones Cientificas, Avda. Gregorio del Amo s/n, 28040 Madrid (Spain)

The positron annihilation technique was used to identify the nature of the vacancy-type defects in the D0{sub 3} and B2 phases of the Fe-Al system. Seven alloys with Al concentrations in the range 22.7-48 at.% Al and with different thermal treatments were examined. Positron lifetime calculations for the expected defects in the two phases were also performed in order to facilitate the defect identification. In the B2 phase, two types of defects were identified: a thermal complex formed by a Fe-divacancy and an Al antisite, and a Fe-vacancy. No constitutional vacancies were found in the D0{sub 3} phase.

• OSTI ID: 20637112
• Journal Information: Acta Materialia, Vol. 53, Issue 1; Other Information: DOI: 10.1016/j.actamat.2004.09.013; PII: S1359-6454(04)00555-5; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANNIHILATION
IRON ALLOYS
POSITRONS
VACANCIES