DEVELOPMENT OF TANTALUM-TUNGSTEN ALLOYS FOR HIGH PERFORMANCE PROPULSION SYSTEM COMPONENTS.
Summary rept. 10 Apr 59-21 June 63,
NATIONAL RESEARCH CORP CAMBRIDGE MASS
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Ta alloys containing up to 30 W were successfully arc-melted as 3-12 inch diameter ingots and fabricated to rod and sheet bar using conventional techniques. Alloys containing up to 20 W were ductile at room temperature in the annealed condition. W additions increased the hardness of Ta at 1200 C to a maximum at about 50 W. The Ta-10W alloy was found to have physical properties, ductility and weldability similar to pure Ta, with about 3 times the tensile strength of pure Ta at 3500 F. arbide thicknesses in the range 1 to 60 mils were obtained by carburizing Ta and Ta-W alloys in the range 2000 to 2500 C. Carburizing temperature was the important variable affecting carbide thickness. W additions resulted in change in the morphology and relative quantities and distribution of the carbide phases. Experimental rocket nozzle firings showed W additions significantly improved the performance of Ta and carburizing results in further improvement. Author