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Creep behaviour of the intermetallic B2 phase (Ni,Fe)Al with strengthening soft precipitates
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1989
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Materials ScienceMaterials EngineeringThreshold StressEngineeringSevere Plastic DeformationSuperalloyMechanical EngineeringApplied PhysicsSoft PrecipitatesCreep BehaviourSolid MechanicsMicrostructure-strength RelationshipDislocation CreepIntermetallic B2 PhaseConventional Power LawAlloy PhaseMechanics Of MaterialsMicrostructure
The creep behaviour of Fe-Ni-Al alloys with the intermetallic (Ni,Fe)Al phase (B2 structure) as matrix and /alpha/-Fe precipitate particles (disordered bcc structure) is studied at 900 and 1000/sup 0/C and compared with that of single-phase B2-(Ni,Fe)Al and other two-phase Fe-Ni-Al alloys with the (Ni,Fe)Al phase. The observed creep behaviour is controlled primarily by dislocation creep which is described by the conventional power law (Dorn equation) with a threshold stress for the strengthening precipitates. Deformation mechanism maps have been calculated. The creep resistance of the investigated alloys is of the order of that of the nickel-base superalloy Inconel 617. (orig.).