Metallurgical Characterization of Aluminum Powder Consolidation.
Annual technical rept. 1 Sep 83-1 Sep 84,
MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
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The influence of metallurgical and process variables on the consolidation, densification, and properties of rapidly solidified aluminum alloy powders is being investigated. Cold compaction, hot pressing, powder extrusion, and explosive consolidation are being used to consolidate rapidly solidified 9.9 aluminum powder reference material, Al-3Li-1Cu-1Mg-0.2Zr a representative low-density, high-modulus alloy, and Al-8Fe-7Ce alloys representative of high-temperature al alloys. The alloys included in the study provide wide variations in hardness, flow stress, work hardening rate, plasticity, and oxide-film thickness. The consolidation techniques selected for the study provide variations in pressure, compaction rate, and extent of oxide-film breakdown. Three 35-kg lots of rapidly solidified alloy powders were prepared by vacuum atomization and the powders were characterized with respect to particle size distribution, cooling rates, constituent phases, and volatile contaminants. The pressure dependence of densification during cold compaction was correlated with the yield stress and work hardening of the three alloys. Originator-supplied keywords include Aluminum alloys, Hot pressing, Densification, Microstructure, Zirconium, Powder metallurgy, Extrusion, Interparticle bonding, Porosity, Degassing, Rapid solidification, Explosive consolidation, Recovery, Lithium, Recrystallization, Consolidation, Iron, Cerium, X Ray diffraction, and Electron Microscopy.
APPROVED FOR PUBLIC RELEASE