SOME PROPERTIES OF FUSED AND SINTERED TANTALUM

Journal Article · Thu Feb 01 04:00:00 EST 1962 · Z. Metallk.

OSTI ID:4828427

Raub, E; Roeschel, E

Strengthening by cold working, softening, and recrystallization of cold- worked tantalum ar-e studied by measuring hardness, tensile properties, deep drawing, and conductivity and by microscopic investigation. The investigated properties depend very much on the purity of the tantalum, especially on its gas content. Pure electron-beam-melted tantalum with very small gas contents shows only a small cold strengthening. Recrystallization and softening begin at a temperature of 600 deg C. By the recrystallization very coarse crystal grains are formed. At the same time the high-temperature tensile strength decreases quickiy. Tantalum with a higher content of gaseous impurities as it is obtained by tungsten arc-melting softens in two steps. The first step at lower temperatures is caused by recovering from cold strengthening with formation oi a smaller grained recrystallization structure. The second step is caused by the gas evolution at higher temperature and formation of a coarse-grained structure. The hightemperature tensile strength then decreases nearly to the value of electron- beam-melted tantalum. (auth)

• Research Organization: Forschungsinstitut fur Edelmetalle und Metallchemie, Gmund, Ger.
• NSA Number: NSA-16-021079
• OSTI ID: 4828427
• Journal Information: Z. Metallk., Journal Name: Z. Metallk. Vol. Vol: 53
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

COLD WORKING
CONFIGURATION
CRYSTALS
DRAWING
ELECTRIC ARCS
ELECTRIC CONDUCTIVITY
ELECTRON BEAMS
EXPANSION
GASES
GRAIN SIZE
HARDNESS
HIGH TEMPERATURE
IMPURITIES
MEASURED VALUES
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
MICROSCOPY
RECOVERY
RECRYSTALLIZATION
SINTERING
TANTALUM
TENSILE PROPERTIES
TUNGSTEN
WIRES