Accession Number : AD0418081

Title :   DISPERSION-STRENGTHENED VANADIUM ALLOYS.

Descriptive Note : Bimonthly rept. no. 4, 14 June 63-13 Aug 63.

Corporate Author : IIT RESEARCH INST CHICAGO ILL

Report Date : 09 SEP 1963

Pagination or Media Count : 12

Abstract : Dispersion-strengthening mechanisms are being investigated as a means of improving creep and stress-rupture properties of vanadium-niobium base alloys. Heat-treating studies of arcmelted and wrought materials containing hafnium or zirconium with carbon indicated that compositions based on V-60w/oNb are comparatively susceptible to hardening by traces of atmospheric contaminants after prolonged exposure at 2000 and 2300 F. Virtually no room-temperature hardening was observed in V-40w/oNb-30w/o Ta base alloys exposed to the same annealing atmospheres. Carbide and oxide dispersants were produced in a V-60w/oNb-1w/o Ti matrix by powder metallurgy techniques. After sintering the compacted powders for 10 minutes at 2800 F and annealing for 16 hours at 2400 F, compositions containing HfC and ZrC exhibited little hardening of the V-Cb-Ti alloy matrix. Dispersions of yttria, lanthana, and hafnia produced large increases in the room-temperature hardness of the matrix after sintering and annealing. (Author)

Descriptors :   (*VANADIUM ALLOYS, DISPERSION HARDENING), (*NIOBIUM ALLOYS, DISPERSION HARDENING), (*TANTALUM ALLOYS, DISPERSION HARDENING), POWDER METALLURGY, SINTERING, HEAT TREATMENT, OXIDES, CARBIDES, TITANIUM ALLOYS, HAFNIUM ALLOYS, ZIRCONIUM ALLOYS, CARBON, CREEP, RUPTURE, STRESSES, HARDNESS, COATINGS, CERIUM COMPOUNDS, HAFNIUM COMPOUNDS, LANTHANUM COMPOUNDS, YTTRIUM COMPOUNDS, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE