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Titolo:
Complex faults in a B2 iron aluminide alloy
Autore:
Pang, L; Kumar, KS;
Indirizzi:
Brown Univ, Div Engn, Providence, RI 02912 USA Brown Univ Providence RI USA 02912 iv, Div Engn, Providence, RI 02912 USA
Titolo Testata:
ACTA MATERIALIA
fascicolo: 12, volume: 49, anno: 2001,
pagine: 2215 - 2226
SICI:
1359-6454(20010717)49:12<2215:CFIABI>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-MICROSCOPIC OBSERVATION; AL-ALLOYS; MECHANICAL-PROPERTIES; STACKING-FAULTS; FEAL; BORON; RECOVERY;
Keywords:
intermetallic compounds; transmission electron microscopy (TEM) dislocations; complex faults; annealing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Kumar, KS Brown Univ, Div Engn, Box D,182 Hope St, Providence, RI 02912 USA Brown Univ Box D,182 Hope St Providence RI USA 02912 I 02912 USA
Citazione:
L. Pang e K.S. Kumar, "Complex faults in a B2 iron aluminide alloy", ACT MATER, 49(12), 2001, pp. 2215-2226

Abstract

Complex faults are present on {100} planes in a Fe-40Al-0.7C-0.5B alloy (all compositions are in atomic percent) but are not observed in a ternary Fe-40Al-0.6C alloy. These faults have a displacement vector of 1/2 < 001 > lying in the plane of the fault. In addition, there is an aluminum layer missing at the fault and a recent study by Cadel et al. (Scripta Metall. 41 (1999)421) has claimed that there is boron segregation at these faults. Six variants of this fault can be present. The occurrence and configurations assumed by the fault depend on the heat-treatment temperature and cooling rate which are thought to influence the presence and migration of boron/vacancy complexes. The width of the complex fault also appears to be a function of the heat-treatment temperature (and hence boron in solid solution). In the quenched and annealed condition as well as in the material air-cooled from 1000 and 800 degreesC, there is evidence for these complex faults being bound by partial dislocations that have a Burgers vector of 1/2 < 001 >. In several instances, when these faults are imaged edge-on, they exhibit a zig-zag appearance indicative of faceting on the cube planes. In addition to these complex faults, thermal antiphase boundaries are also observed in some heat-treatment conditions and are postulated to be a consequence of the recrystallized extruded structure. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 25/11/20 alle ore 00:25:25