PROPERTIES OF TUNGSTEN ALLOYS WITH RHENIUM (in Russian)
The W-Re phase diagram was studied in the solid solution region, which ranges from nearly 45 wt. % rhenium at 2850 deg C(near the melting point) to 32 wt % rhenium at 1100 deg C. From the x-ray-diffraction data, it was concluded that beyond the 10 st. % rhenium region, the solid solution undergoes a phase transformation. A very hard sigma type compound was formed at 2890 deg C by a peritectic reaction. The range of solid solutions of tungsten in rhenium is somewhat narrower, from 15 wt. % near the melting point to 12 wt % at 1100 deg C. A eutectic mixture was formed between the rhenium-based solid solution and the sigma phase, containing 75 wt. % rhenium and having a hardness of 800 kg/mm/sup 2/. The microhardness of the sigma phase was 2000 kg/mm/sup 2/. Introduction of rhenium into tungsten increased the recrystallization temperature, tensile strength, and plasticity of the system. Wires of a tungsten alloy containing 20 wt.% rhenium had a tensile strength of 160 to 190 kg/mm/sup 2/ and an elongation of 18 to 20% after annealing. The specific resistivity also increaesd considerably. These alloys are recommended for use in vacuum tubes as cathode, heater wire, etc. The alloys are also useful as thermocouple wire and as contact material. (TTT)
- Research Organization:
- Inst. of Metallurgy, Academy of Sciences, USSR
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-003126
- OSTI ID:
- 4120782
- Journal Information:
- Metalloved. i Termichesk. Obrabotka Metal., Journal Name: Metalloved. i Termichesk. Obrabotka Metal. Vol. Vol: No. 9
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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Related Subjects
CATHODES
DIFFRACTION
DUCTILITY
EUTECTICS
HARDNESS
HIGH TEMPERATURE
MELTING POINTS
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
PHASE DIAGRAMS
REACTION KINETICS
RECRYSTALLIZATION
RHENIUM
RHENIUM ALLOYS
SOLID SOLUTIONS
TEMPERATURE
TENSILE PROPERTIES
THERMOCOUPLES
TUBES
TUNGSTEN
TUNGSTEN ALLOYS
USES
VACUUM
WIRES
X RADIATION