Specialists Meeting on Directionally Solidified In-Situ Composites (38th) Held in Washington, D.C. on 23-24 April 1974.
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT PARIS (FRANCE)
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It has long been recognized by the military aircraft community that increasing the temperature of turbine inlet gas in aircraft gas turbine engines offers attractive advantages in aircraft performance and economy. The high temperature characteristics of available materials of construction determine, to a large extent, the limits to which an engine can be designed. Thus the materials community has been engaged in trying to increase the high temperature capabilities of gas turbine materials. Directionally solidified eutectic alloys offer a new and very attractive approach toward increased metal operating temperatures. In contrast with the conventional precipitation hardened superalloys which tend to dissolve their strengthening precipitates at the very high temperatures and long times of operation, the eutectics should exhibit greater phase stability under these conditions. By proper alloy selection it has been found possible to precipitate very strong filaments or platelets of one metallurgical phase in a more ductile matrix of another and thus to achieve high temperature strengths far exceeding those of the best current superalloys. In essence the result is a metal matrix composite created in-situ during directional solidification. The Specialists Meeting on In-situ Composites is reported on in this volume.
- Laminates and Composite Materials
- Metallurgy and Metallography
- Jet and Gas Turbine Engines