This publication documents Proceedings of the Symposium on Metal lurgy and Technology of Refractory Metal Alloys, held in Washington, D.C. at the Washington Hilton Hotel on April 25-26, 1968, under sponsorship of the Refractory Metals Committee, Institute of Metals Division, of the Metallurgical Society of AIME, and the National Aeronautics and Space Administration. The Symposium presented critical reviews of selected topics in refractory metal alloys, thereby contributing to an in-depth understanding of the state-of-the-art, and establishing a base line for further research, development, and application. This Symposium is fifth in a series of conferences on refractory metals, sponsored by the Metallurgical Society of AlME. Publications issuing from the conferences are valuable technical and historical source books, tracing the evolution of refractory metals from early laboratory alloying studies to their present status as useful engineering materials. Refractory metals are arbitrarily defined by melting point. A 0 melting temperature of over 3500 F was selected as the minimum for this Symposium, thus excluding chromium and vanadium, which logically could be treated with other refractory metals in Groups VA and VIA of the periodic table. The Refractory Metals Committee is planning reviews of chromium and vanadium in subsequent conferences.

Three inch diameter billets of TZM plus 1.5% Cb Molybdenum, alloy tungsten alloys, superalloys (B-1900, 713-C, U-700 and Rene 41), Inconel X were extruded on an instrumented 700 Ton Experimental Extrusion Press to establish a relationship among extrusion pressures, billet material properties, and processing parameters. The following relationship was established: P equals AY plus bY 1n R plus S (cot alpha) 1n R plus 4 k L/D where P is total extrusion pressure, a and b are constants for each die angle, Y is material flow strength at temperature and strain rate of processing, R is reduction ratio, alpha is extrusion die half angle, L is billet length in container, D is container diameter, and S and k are interface shear strength in die and liner respectively. (Author).