METALLURGICAL PROGRESS REPORT NUMBER 14 FOR THE PERIOD OF JANUARY 1, 1962 TO MARCH 31, 1962

Technical Report · Wed Oct 31 00:00:00 EST 1962

OSTI ID:4830119

Heat treatment and metallography were utilized to establish the eutectic composition, the vanadium solvus, the alpha, alpha plus beta, and beta-hafuium areas of the hafnium-vanadium alloy system. It appeared that both hafuium and vanadium are insoluble in the stoichiometric alloy HfV/sub 2/ (63.3% V). A study of the hafuium-iridium system was started. Alloys containing from 5 to 90% iridium were prepared. Studies are continuing on alloy systems of erbium and samarium combined with Ca, V, Cr, Zr, Fe, Ni, Cu, Al, and Si. The investigation of the chromiumgadolinium and the nickel-gadolinium phase diagrams was completed. Joining niobium and tantalum by high-temperature diffusion and low-pressure bonding was successful and it is apparent that pressure bonding may be a means of producing high-strength joints. An examination of Hf-C systems containing up to 2.4% carbon is continuing. Homogeneous molybdenum metal-gadolinium oxide compacts were prepared by mixing in a ball-mill, compacting, and sintering in a vacuum for 8 hours at 1800 deg C, or in a hydrogen atmosphere at 1500 deg C. No apparent diffusion reaction occurred between the two constituents. The melting point of thorium was established as 1725 deg C. The 90 Th-10 Ho alloy melts at 1700 deg C; the 60-40 alloy at 1640 deg C. The melting point of the 50 Th-50 Nd alloy melts at 1200 deg C. Thorium-10 and 50% praseodymium alloys melt at 1562 deg C and 1215 deg C, respectively. The following transformation temperature variations were noted: Thorium- 1365 deg C (base); Th 60-Ho 40, 1430 deg C; Th 50- Nd 50, 1160 deg C; Th 50-Pr 50, 1080 deg C. Countercurrent leaching tests were initiated to prepare pregnant solutions of potassium zirconium fluoride (K/sub 2/ ZrF/sub 6/) and potassium hafnium fluoride (K/sub 2/HfF/sub 6/) for fractional crystallization and selective leaching studies. Selective leaching of K/sub 2/ HfF/sub 6/ from se as a method of producing hafnium-enriched liquors. A limited investigation of the thermodynamics of the cold-mold did not produce additional significant data. At temperatures in the order of 2600 deg K to 2900 deg K, oxygen was removed from hafnium in the form of HfO in electron-beam melting. Aluminum, magnesium, titanium, and zirconium are evaporated as the monoxides. Density of various hafniumcarbon alloys range from 12.214 g/cm/sup 3/ for the stoichiometric composition (6.36% carbon) to 9.859 g/cm/sup 3/ for the 11.2 wt.% composition. Small ingots containing from 9 to 12% carbon are machinable. As- cast ingots, prepared by consumable electrode arc melting pressed bars of uranium saw cuttings and graphite powder, contained a major phase of uranium monocarbide and an intergranular uranium phase. (auth)

• Research Organization: Bureau of Mines. Albany Metallurgy Research Center, Ore.
• DOE Contract Number: AT(11-1)-599
• NSA Number: NSA-16-019374
• OSTI ID: 4830119
• Report Number(s): USBM-U-921
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-62
• Country of Publication: United States
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ALLOYS
ALUMINUM
BEAMS
BONDING
CALCIUM
CARBON
CASTING
CHROMIUM
COMPACTING
COPPER
COUNTERS
CRYSTALLIZATION
CURRENTS
DENSITY
DIFFUSION
ELECTRIC ARCS
ELECTRODES
ELECTRONS
ENRICHMENT
ERBIUM
EUTECTICS
EVAPORATION
GADOLINIUM
GADOLINIUM OXIDES
GRAPHITE
HAFNIUM ALLOYS
HAFNIUM FLUORIDES
HAFNIUM OXIDES
HEAT TREATMENTS
HIGH TEMPERATURE
HOLMIUM
HOMOGENEOUS REACTORS
HYDROGEN
IRIDIUM ALLOYS
IRON
JOINTS
LEACHING
LIQUIDS
MACHINING
MAGNESIUM
MELTING
MELTING POINTS
METALLOGRAPHY
METALS
MILLING
MIXING
MOLYBDENUM
NEODYMIUM ALLOYS
NICKEL
NIOBIUM
OXYGEN
PHASE DIAGRAMS
POTASSIUM
POWDERS
PRASEODYMIUM ALLOYS
PREPA