INVESTIGATION OF TUNGSTEN-TANTALUM-COLUMBIUM-BASE ALLOYS. Period Covered: March 15, 1960 to December 31, 1960
Two categories of properties pertaining to selected refractory alloy systems are presented. The alloys were screened as to their usefulness as high- temperature structural materials. Measurements of hot-hardness and oxidation resistance of arc-cast specimens delineated areas within the tungsten--tantalum-- niobium ternary systems combining high hardness at temperatures up to 2900 deg F with improved oxidation resistance at 2l90 deg F. The addition of tungsten and titanium was found to improve the oxidation resistance of tantalum at 1830 and 2190 deg F, probably because of the formation of complex oxides in the outer scale. The second area of investigation was concerned with mechanical properties of tungsten or niobium at low and intermediate temperatures. The low-temperature yield properties of tungsten were studied, employing a compression test. Static strain-aging of tungsten at 400 to 600 deg C was attributed to hydrogen. Dynamic strain-aging of niobium-oxygen systems occurred at 300 to 400 deg while the addition of titanium, zirconium, and vanadium to niobium was found to shift the strain-aging region to 700 to 800 deg C. (auth)
- Research Organization:
- Union Carbide Metals Co., Niagara Falls, N.Y.
- NSA Number:
- NSA-16-003443
- OSTI ID:
- 4832339
- Report Number(s):
- ASD-TR-61-3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DEFORMATION
HARDNESS
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGEN
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM
NIOBIUM ALLOYS
OXIDATION
OXIDES
OXYGEN
TANTALUM ALLOYS
TEMPERATURE
TENSILE PROPERTIES
TITANIUM ALLOYS
TUNGSTEN
TUNGSTEN ALLOYS
VANADIUM ALLOYS
ZIRCONIUM ALLOYS