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Analysis of in situ rapid solidification of submicron Al-Ge eutectic powders using transmission electron microscopy

Journal Article · · Metall. Trans., A; (United States)
DOI:https://doi.org/10.1007/BF02643778· OSTI ID:5581833
;
Submicron powders of Al-30.3 at. pct Ge (eutectic), produced by electrohydrodynamic atomization, have been analyzed in a transmission electron microscope operating at 120 kV. Amorphous and complex crystalline structures were observed in the as-atomized condition. By using the electron beam as a local heating source, powders could be either annealed at temperatures below their melting point or melted. Molten powders were quenched at various cooling rates by altering the rate of beam obstruction. Using this technique, nonequilibrium structures were produced including metastable phases and mixed amorphous/crystalline microstructures. These various structures have been related to cooling rates and compared to the as-atomized structures. Crystallization of the amorphous regions produced by this technique has also been studied.
Research Organization:
Department of Metallurgy and the Materials Research Laboratory at the University of Illinois, Urbana, IL 61801
DOE Contract Number:
AC02-76ER01198
OSTI ID:
5581833
Journal Information:
Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 14A; ISSN MTTAB
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
AMORPHOUS STATE
ANNEALING
ATOMIZATION
BEAM INJECTION HEATING
BEAMS
CRYSTAL STRUCTURE
CRYSTALLIZATION
ELECTROHYDRODYNAMICS
ELECTRON BEAMS
ELECTRON MICROSCOPY
EUTECTICS
FLUID MECHANICS
GERMANIUM ALLOYS
HEAT TREATMENTS
HEATING
HYDRODYNAMICS
IN-SITU PROCESSING
LEPTON BEAMS
MECHANICS
METALLURGY
MICROSCOPY
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PLASMA HEATING
POWDER METALLURGY
POWDERS
PROCESSING
SOLIDIFICATION
TRANSMISSION ELECTRON MICROSCOPY