Processing influences on elevated temperature properties of reaction synthesized Fe{sub 3}Al

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:233986

Lillo, T M; Wright, R N; Wright, J K; Rabin, B H ^[1]

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1. Lockheed Idaho Technologies Co., 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 gain size of less than 5{micro}m. Processing strongly influences the propensity toward secondary recrystallization. While the HIPped material is extremely resistant to grain growth, under some circumstances the hot extruded material undergoes secondary recrystallization, resulting in grain sizes of several 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.

• DOE Contract Number: AC07-94ID13223
• OSTI ID: 233986
• Report Number(s): CONF-950908--; ISBN 0-87170-539-7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
EXPERIMENTAL DATA
EXTRUSION
FABRICATION
GRAIN SIZE
HEAT TREATMENTS
HOT PRESSING
INTERMETALLIC COMPOUNDS
IRON ALLOYS
OXIDES
PARTICULATES
POWDERS
RECRYSTALLIZATION
STRAIN RATE
SYNTHESIS
TENSILE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY
YIELD STRENGTH