DETERMINATION OF INTERSTITIAL SOLID-SOLUBILITY LIMIT IN TANTALUM AND IDENTIFICATION OF THE PRECIPITATE PHASES

Technical Report · Fri Oct 28 00:00:00 EDT 1960

DOI:https://doi.org/10.2172/4136537· OSTI ID:4136537

Vaughan, D. A.; Stewart, O. M.; Schwartz, C. M.

Solid-solubility limits at 1500, 1000, snd 500/sup o/C for carbon, nitrogen, and oxygen in high-punity tantalum were determined by x-ray lattice- parameter methods. For carbon, the solubility was found to be 0.17 at. % at 1500/sup o/C and less than 0.07 at. % at l00/sup o/C. A nitrogen solubility of 3.70 at. % at l500/sup o/C decreased linearly with temperature to 2.75 at. % at 1000/sup o/C and 1.8 at. % at 500/sup o/C. In the case of oxygen, the solubility was found to be 3.65 at. % at 1500/sup o/C, 1.95 at. % at l0O0/sup o/ C, and 2.5 at. % at 500/sup o/C. The phases Ta/sub 2/, the lowtemperature modificstion of Ta/sub 2/O/sub 5/, and Ta/sub x/N of unknown coznposition hut which has a superlattice structure based upon the oniginsl body-centered-cubic tantalum lattice were identified is the initisl precipitates in the respective systems. (auth)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• NSA Number: NSA-15-004278
• OSTI ID: 4136537
• Report Number(s): BMI-1472
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CARBON
HIGH TEMPERATURE
LATTICES
LOW TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
NITROGEN
OXYGEN
PHASE DIAGRAMS
PRECIPITATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
SOLID SOLUTIONS
SOLUBILITY
STANDARDS
TANTALUM
TANTALUM CARBIDES
TANTALUM NITRIDES
TANTALUM OXIDES
TEMPERATURE
X RADIATION