Rapid-solidification processing and powder metallurgy of al alloys. Final technical report, 15 April 1982-15 April 1985
Regarding work on the development of microstructure during rapid solidification, three areas were addressed. The first of these involved a determination of the mechanism of formation of the so-called zones A and B in hypereutectic Al-transition metal alloys. The second area of work involving the development of microstructure concerns submerged phase transformations. In a study of Al-Be hypereutectic alloys, it was determined that solidification proceeded by a set of phase transformations that may be described by a monotectic reaction. The third area of study concerning microstructural development involves quasi-crystalline Al alloys. In fact, work done in this program has concentrated on the potentially beneficial aspects of quasi-crystalline phases in the microstructure of Al alloys. Work on the consolidation of particulate was concentrated on the use of conventional techniques (.e. extrusion) and novel processes (i.e. dynamic compaction). An estimate of the mechanical properties of rapidly solidified Al alloys was obtained. As explained above, the effect of extrusion is to cause decomposition of the rapidly solidified microstructure. A comparison was made, using the alloy Al-8Fe-2Mo, between the tensile properties of the decomposed microstructure (.e. extruded) and subscale test specimens produced by laser surface melting, consisting entirely of zone A.
- Research Organization:
- Illinois Univ., Urbana (USA). Dept. of Material Science
- OSTI ID:
- 7140359
- Report Number(s):
- AD-A-174553/8/XAB
- Country of Publication:
- United States
- Language:
- English
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ALUMINIUM BASE ALLOYS
PHASE TRANSFORMATIONS
BERYLLIUM ALLOYS
IRON ALLOYS
MOLYBDENUM ALLOYS
CRYSTALS
EUTECTICS
EXTRUSION
MICROSTRUCTURE
POWDER METALLURGY
SOLIDIFICATION
TENSILE PROPERTIES
ALLOYS
ALUMINIUM ALLOYS
CRYSTAL STRUCTURE
FABRICATION
MATERIALS WORKING
MECHANICAL PROPERTIES
METALLURGY
360102* - Metals & Alloys- Structure & Phase Studies
360101 - Metals & Alloys- Preparation & Fabrication