Phase diagram, superlattices and antiphase domains of Fe sub 3 Al sub x , 0.75 < =x < =1.3, investigated by neutron scattering

The states of order of Fe-Al alloys with compositions around Fe sub 3 Al have been investigated by neutron scattering. The results lead to the following description of their structures. These alloys have the long-range ordered DO sub 3 structure up to the following temperatures: Fe-0.2Al up to at le...

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Bibliographic Details
Published in:Acta metallurgica et materialia 1994-03, Vol.42 (3), p.731-741
Main Authors: Hilfrich, K, Petry, W, Scharpf, O, Nembach, E
Format: Article
Language:English
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Summary:The states of order of Fe-Al alloys with compositions around Fe sub 3 Al have been investigated by neutron scattering. The results lead to the following description of their structures. These alloys have the long-range ordered DO sub 3 structure up to the following temperatures: Fe-0.2Al up to at least 873K, Fe-0.25Al and Fe-0.3Al up to approx1050K, atomic fractions of Al are quoted. Some phase boundaries shown in the current Fe-Al phase diagram turned out to be no phase boundaries at all, but to have bearing only on the size of antiphase domains. There are critical temperatures above which antiphase domain boundaries are in thermodynamic equilibrium. The present results suggest revisions of the current Fe-Al phase diagram.
ISSN:0956-7151