Accession Number : ADA133873

Title :   Rapid Solidification Processing and Powder Metallurgy of Al Alloys.

Descriptive Note : Annual rept. 15 Apr 82-14 Apr 83,

Corporate Author : ILLINOIS UNIV AT URBANA DEPT OF METALLURGY AND MINING ENGINEERING

Personal Author(s) : Fraser,Hamish L

PDF Url : ADA133873

Report Date : 19 Sep 1983

Pagination or Media Count : 68

Abstract : During the first period of performance, three tasks have been undertaken. These involve first a study of the specific microstructural changes that accompany rapid solidification of a number of Al alloys together with a determination of the thermal stability of these microstructures, second the production of rapidly solidified particulate and third the use of dynamic powder compaction (DPC) for the consolidation of rapidly solidified particulate in the absence of prolonged thermal excursions. A number of alloys have been rapidly solidified using laser surface melting and melt-spinning and in each case the observed microstructure has been interpreted in terms of the undercooling achieved during processing. Rapidly solidified (gas atomized) powders of 7091 have been consolidated using DPC. Is has been shown that bulk samples may be produced that are close to theoretical density.

Descriptors :   *Aluminum alloys, *Solidification, *Powder metallurgy, *Powder metals, Quick reaction, Lasers, Melting, Thermal stability, Phase transformations, Microstructure, Particulates, Compacting, Cooling, Heat treatment, Refining, Thermal resistance, Hardness, Strength(General), Dendritic structure, Iron, Molybdenum, Cerium

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE