INVESTIGATION OF TANTALUM AND ITS ALLOYS

Technical Report · Fri Mar 01 04:00:00 EST 1963

OSTI ID:4702032

Schmidt, F F; Bartlett, E S; Ogden, H R

Minor (1 to 2%) reactive metal (Zr, Hf) additions to Ta-W-- Mo alloys effect pronounced strengthening at 1925 deg C with minimal degradation of low- temperature alloy behavior. Additions of carbon to alloys containibg reactive metals degrade both 1925 deg C strength and low-temperature behavior; however, ZrC dispersions exhibit pronounced strengthening at lower temperatures (1480 deg C). Solutionprocess anneals for alloys containing ZrC dispersion greatly increase strength at 1480 deg C, but seriously impair fabricability and ductility. Molybdenum is a less effective strengthener than tangsten as an alloding addition to tantalum. Tungstcn additions provide higher stress-rupture strengths with less degrading effects on low-temperathre ductility than do equivalent atomic percentages of molybdenum. Welding increases the ductile-to-brittle transition temperature of Ta--W--Mo alloys by 300 to 500 deg C. Rhenium and ruthenium additions showed little or no superiority to tungsten as solid-solution strengtheners, when both high- and low-temperature effects were considered. (auth)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• NSA Number: NSA-17-029312
• OSTI ID: 4702032
• Report Number(s): ASD-TDR-62-594(Pt.II); AD-4067
• Country of Publication: United States
• Language: English

Related Subjects

ANNEALING
BRITTLENESS
CARBON
DISPERSIONS
DUCTILITY
FABRICATION
FAILURES
HAFNIUM
HIGH TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
RHENIUM
RUTHENIUM
SOLID SOLUTIONS
STRESSES
TANTALUM
TANTALUM ALLOYS
TEMPERATURE
TENSILE PROPERTIES
TUNGSTEN ALLOYS
WELDING
ZIRCONIUM
ZIRCONIUM CARBIDES