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Interaction of boron with crystal defects in B2-ordered FeAl alloys

Published online by Cambridge University Press:  21 March 2011

Anna Fraczkiewicz ,
Anne-Sophie Gay ,
Emmanuel Cadel  and
Didier Blavette
Anna Fraczkiewicz
Affiliation:
ENSMSE, Centre SMS, URA CNRS 1884, 158 Cours Fauriel, F-42023 ST-ETIENNE
Anne-Sophie Gay
Affiliation:
ENSMSE, Centre SMS, URA CNRS 1884, 158 Cours Fauriel, F-42023 ST-ETIENNE
Emmanuel Cadel
Affiliation:
Université de Rouen, UMR 6634 CNRS, Faculté des Sciences de Rouen, F-76 821 MONT ST-AIGNAN
Didier Blavette
Affiliation:
Université de Rouen, UMR 6634 CNRS, Faculté des Sciences de Rouen, F-76 821 MONT ST-AIGNAN
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Abstract

Intermetallic alloys are often doped with boron to suppress their intrinsic room-temperature intergranular brittleness. The commonly admitted mechanism of this effect, i.e. an intergranular segregation of boron, seems not to be the only important feature. In this work, boron interactions with numerous kinds of crystal defects (point defects, dislocations, grain boundaries) are studied in B-doped FeAl (B2) alloys containing 40 at. % Al. The intergranular segregation of boron is first characterized. Both an equilibrium and a non-equilibrium (due to a solute atom / thermal vacancy interaction) segregation mechanisms are identified. Strong tendency of boron to segregate to the dislocations lines is shown by direct measurements by atom probe field ion microscopy (AP FIM). This segregation is shown to induce a local depletion in Al in the vicinity of defects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N3.4.1
Copyright
Copyright © Materials Research Society 2001

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References

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