INVESTIGATION OF DIFFUSION BARRIERS FOR REFRACTORY METALS. Progress Report No. 5, October 15, 1960 to January 15, 1961
Diffusion zone measurements are presented for 10 Mo and Nb-base combinations as well as for several W/sup -/, Ta/sup -/, and Mo-base combinations reported previously on the basis of preliminary results. Using a criterion that the total dif fusion zone shouid not exceed 50 mu (after annealing 1 hr at 1700 deg C) and that the hardness increment at the interface should not exceed 500 KHN, the following 12 base-barrier combinations appeared most promising: Os, Ir, Rh, and V barriers on W base metal; W and Zr barriers on Ta base metal; W and Re barriers on Mo base metal; and W, Re, Ta, and Mo barriers on Nb base metal. Consideration will still be given to 9 other combinations (W-Ru, W-Hf, Ta-Re, Ta- Os, Ta-Ir, Mo- Ta, Mo-Ir, Nb-Os, and Nb-lr), although they appeared somewhat less promising than the first 12 because of either high hardness increments or questionable data. In addition, 6 combinations (Ta-Hf, Mo -V, Nb-Ru, Nb-Hf, Nb- V, and Nb-Zr) are yet to be screened. Longer time diffusion-annealing experiments are being carried out in an attempt to determine the relative potential of the more promising combinations. From the results of these experiments, barrier metals will be selected for studies of interdiffusion characteristics with respect to alloy base metals and for quantitative determination of diffusion characteristics with respect to unalloyed base metels. (auth)
- Research Organization:
- Manufacturing Labs., Inc., Cambridge, Mass.
- NSA Number:
- NSA-15-014717
- OSTI ID:
- 4051166
- Report Number(s):
- NP-9881
- Country of Publication:
- United States
- Language:
- English
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INVESTIGATION OF DIFFUSION BARRIERS FOR REFRACTORY METALS
REFRACTORY METAL PHASE DIAGRAMS. Quarterly Progress Report for the Period July 15, 1959 to October 15, 1959
Related Subjects
BARRIERS
DIFFUSION
HAFNIUM
HARDNESS
HIGH TEMPERATURE
HYDROXIDES
IRIDIUM
MEASURED VALUES
METALS
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
MOLYBDENUM HYDROXIDES
NIOBIUM HYDROXIDES
OSMIUM
REFRACTORIES
RHENIUM
RHODIUM
RUBIDIUM
SURFACES
TANTALUM
TANTALUM HYDROXIDES
TUNGSTEN
TUNGSTEN HYDROXIDES
VANADIUM HYDROXIDES
ZIRCONIUM
ZONES