Application of Rapidly Solidified Alloys.
Quarterly rept. 1 Nov 78-1 Feb 79,
PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
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This program is being conducted for the purpose of applying the principle of rapid solidification of aluminum and iron alloy powders and subsequent development of stronger alloy compositions for fan blade application Al alloys and higher speed bearing material Fe alloys. Centrifugal atomization and forced convective cooling are being used to produce the fast-cooled powder. During this report period, adaptation of the RSR Rapid Solidification Rate process to aluminum and iron systems was continued. Both Al and Fe alloys were produced and consolidated by direct extrusion. Hardness and mechanical testing were begun for initial evaluation of aluminum alloys. This program has demonstrated that controlled, rapid solidification can lead to a microcrystalline form, a condition which could possibly point the way to alloy homogeneity never before considered possible. It has also shown that a central rotary source can be used for liquid metal atomization into powder particles of sizes commensurate with average particle cooling rates of 100,000-1,000,000 Ksec. The specific objectives of this effort are the development of an improved aluminum alloy suitable for VSTOL-A fan blades and an improved iron alloy suitable for rolling element bearings for advanced aircraft powerplants. Originator supplied keywords include Powder metallurgy.
- Metallurgy and Metallography