Defect and atomic ordering studies in highly deformed and disordered Fe{sub 72}Al{sub 28} alloy

Journal Article · Thu May 01 04:00:00 EDT 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00299-6· OSTI ID:509147

Jiraskova, Y; Schneeweiss, O; Sob, M ^[1]; Novotny, I ^[2]

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1. Academy of Sciences of the Czech Republic, Brno (Czech Republic). Inst. of Physics of Materials
2. Charles Univ., Prague (Czech Republic). Dept. of Low Temperature Physics

The results of positron annihilation and Moessbauer spectroscopies in Fe{sub 72}Al{sub 28} alloy with different structural morphology obtained by severe deformation and by quenching from a high temperature are presented. The changes in atomic ordering and in defect arrangements after recovery and ordering annealing in both highly deformed and highly disordered samples are also pursued and discussed. It is shown that the dominant component of 184 ps in the positron lifetime spectrum of a highly disordered sample corresponds to the annihilation in vacancies which prefer to occupy that sublattice in D0{sub 3} superstructure containing both aluminium and iron atoms. Important changes in vacancy concentration take place only when an annealing above D0{sub 3}{leftrightarrow}B2 (823 K) is performed. Temperature treatment below this phase transformation temperature is characterized above all by changes in the density of dislocations.

• OSTI ID: 509147
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 5 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANNEALING
DEFORMATION
DISLOCATIONS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MICROSTRUCTURE
ORDER-DISORDER TRANSFORMATIONS
QUENCHING
VACANCIES