The influence of processing on microstructure and properties of iron aluminides

Conference · Tue Aug 01 04:00:00 EDT 1995

OSTI ID:416493

Wright, R N; Wright, J K ^[1]

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1. Idaho National Engineering Lab., Idaho Falls, ID (United States)

An Fe-28%Al alloy containing 5% Cr has been synthesized by reaction of elemental powders, followed by consolidation using hot isostatic pressing or hot extrusion. The resulting materials are fully dense, homogeneous, and have a grain size of less than 5{mu}m. Processing strongly influences the propensity toward secondary recrystallization. While HIPped material is extremely resistant to grain growth, under some circumstances hot extruded material undergoes secondary recrystallization, resulting in grain sizes as large as 25 millimeters. Elevated temperature tensile properties and strain rate sensitivities are reported for fine and very coarse grained materials. Grain boundary sliding is not a significant deformation mode for any of the materials. The properties are compared to those of Fe{sub 3}Al processed from conventional hot extruded prealloyed. powder. It has been found that the reaction synthesized materials generally have superior elevated temperature tensile strength.

• Research Organization: Oak Ridge National Lab., TN (United States)
• OSTI ID: 416493
• Report Number(s): ORNL/FMP--95/1; CONF-9505204--; ON: DE96001412
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
DEFORMATION
GRAIN GROWTH
IRON BASE ALLOYS
MICROSTRUCTURE
POWDERS
RECRYSTALLIZATION
STRAIN RATE
TENSILE PROPERTIES