A Study of Ternary Phase Diagrams of Tungsten and Tantalum
Technical rept. 1 Apr 1958-31 Jul 1959
IIT RESEARCH INST CHICAGO IL
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Phase relationships in 36 ternary refractory metal systems were investigated. Some 28 related binary systems were first established by reviewing the literature and doing whatever supplementary experimental work necessary to assure a valid basis for the ternary studies. Nearly 200 ternary alloy compositions were prepared from high-purity alloying ingredients by nonconsumable electrode arc-melting procedures. These alloys were studied metallographically in the as-cast condition as well as after annealing at and quenching from 1500 and 1000 deg C. The main purpose of thin effort was to scan the solid solubility limits of ternary systems based on tungsten andor tantalum and involving the following metals molybdenum, niobium, vanadium, chromium, osmium, and rhenium. The diagrams presented herein are intended to serve as a foundation for future alloy development. Because none of the systems presented is completely detailed, definitive work can and should be done as the specific need arises.
- Metallurgy and Metallography