Accession Number : ADA182165

Title :   Metallurgical Characterization of Aluminum Powder Consolidation.

Descriptive Note : Final technical rept. 1 Sep 83-1 Mar 87,

Corporate Author : MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO

Personal Author(s) : Sastry,S M ; Lederich,R J ; Peng,T C ; O'Neal,J E

PDF Url : ADA182165

Report Date : May 1987

Pagination or Media Count : 77

Abstract : The influence of metallurgical and process variables on the consolidation, densification, and properties of rapidly solidified aluminum alloy powders was investigated. Cold compaction, hot pressing, powder extrusion, and explosive consolidation were used to consolidate rapidly solidified 99.9% aluminum powder. The alloys included in the study provide wide variations in hardness, flow stress, work hardening rate, plasticity, and oxide-film thickness. The consolidation techniques for the study provide variations in pressure, compaction rate, and extent of oxide film breakdown. Three 35-kg lots of rapidly solidified 99.9% A1 and aluminum 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 alloys. Keywords: Aluminum alloys, Hot pressing, Densification, Microstructure, Zirconium, Powder metallurgy, Extrusion, Recovery, Porosity, Degassing, Rapid solidification, Explosive consolidation, Interparticle bonding, Lithium, Recrystallization, Consolidation, Iron, Cerium.

Descriptors :   *ALUMINUM ALLOYS, *COMPACTING, *POWDER ALLOYS, *POWDER METALLURGY, ALLOYS, CERIUM, RATES, COOLING, FLOW, STRESSES, LOW TEMPERATURE, PHASE, EXTRUSION, HOT PRESSING, METALWORKING, MECHANICAL PROPERTIES, PARTICLE SIZE, PLASTIC PROPERTIES, HIGH TEMPERATURE, DENSITY, FILTRATION, ELECTROFORMING, MICROSTRUCTURE, QUICK REACTION, SOLIDIFICATION, CONTAMINANTS, VOLATILITY, HARDENING, RATES, ZIRCONIUM, DISTRIBUTION, POROSITY, PRESSURE, RECRYSTALLIZATION, ATOMIZATION, VACUUM, YIELD

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE