QUARTERLY METALLURGICAL PROGRESS REPORT NUMBER 19, APRIL 1-JUNE 30, 1963

Technical Report · Thu Oct 31 00:00:00 EST 1963

OSTI ID:4667374

The investigation of the stainless steel-gadolinium system was completed and the determination of physical properties was started. The study of the iron-- chromium-gadolinium system was started. The solubility of selected non-rare earth alloying additions in dysprosium, erbium, gadolinium and samarium and their effect on transformation temperatures neared completion and phase diagrams were drawn. Also, the effects of the selected non-rare earth alloying additions on the oxidation and corrosionresistance properties of dysprosium, erbium, and gadolinium were investigated. The hafnium -vanadium phase diagram was completed on resolving the vanadium solvus. The analysis of the hafnium-tantalum system was completed on the determination of the boundaries of the solid state miscibility gap by using X-ray diffraction techniques. Except for resolving the structures, melting points, and mutual solid solubilities of the compounds Hf/sub 3/Ir/sub 2/Ir/sub 2/ and HfIr, the investigation of the hafnium--iridium phase diagram was completed. The hafnium-carbon system also continued to be investigated. The effects of time, temperature, and amount of cold work on the recrystallization temperature of thorium-cerium and thorium--lanthanum alloys, the measuring of hardness with varying amounts of cold work, and the preparation of tensile samples were studied. Homogeneous alloys were developed from powders of molybdenum metal with gadolinium oxide and tungsten metal with gadolinium, erbium, samarium, or europium oxides by the screen and ball-mill mixing technique; pressed powder compacts were made using a one-way press; the pressed powder compacts were sintered in hydrogen and in vacuum at different temperatures to obtain optimum densities; hammer forging and rolling experiments were conducted at various temperatures; tensile tests were partially completed, and oxidation-resistance tests were started. TIG welding of niobium was conducted in an atmosphere of helium with small controlled additions of oxygen or nitrogen or both. Embrittlement of the weld was caused by a partial pressure of any of the following in microns of mercury: 400 oxygen, 200 oxygen with 100 nitrogen, 100 oxygen with 200 nitrogen, or 400 nitrogen. Diffusion bonding of niobium at relatively low contact pressure and low temperature was attempted with indium, nickel and ultrafine tungsten powder used as interfacial materials. Data are not complete on three phases of the cold-mold crucible study; the annular water cooling space, the vertical distribution of heat, and the temperature gradient within the crucible wall. Electron beam melting of reactive metals continues, attention now being directed to yttrium and zirconium. Attempts are now in process to produce small tensile specimens of hafnium carbide. Button tests with uranium mononitride indicate the necessity for a pressurized arc furnace to prevent decomposition of the ritride during melting. (auth)

• Research Organization: Bureau of Mines. Albany Metallurgy Research Center, Ore.
• DOE Contract Number: AT(11-1)-599
• NSA Number: NSA-17-034330
• OSTI ID: 4667374
• Report Number(s): USBM-U-1057
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: United States
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ALLOYS
BONDING
CARBON COMPOUNDS
CERIUM ALLOYS
CHROMIUM ALLOYS
COLD WORKING
COOLING
CORROSION
CRYSTALLIZATION
DIFFUSION
DYSPROSIUM
ELECTRON BEAMS
ERBIUM
ERBIUM OXIDES
EUROPIUM OXIDES
GADOLINIUM
GADOLINIUM ALLOYS
GADOLINIUM OXIDES
HAFNIUM CARBIDES
HAFNIUM COMPOUNDS
HARDNESS
HEAT TRANSFER
HEATING
HELIUM
HYDROGEN
INDIUM
INTERMETALLIC COMPOUNDS
IRIDIUM COMPOUNDS
IRON ALLOYS
LANTHANUM ALLOYS
LATTICES
MELTING
METALLURGY
MIXING
MOLYBDENUM
NICKEL
NIOBIUM
NITRIDES
NITROGEN
OXIDATION
OXYGEN
PHASE DIAGRAMS
POWDER METALLURGY
SAMARIUM
SAMARIUM OXIDES
SINTERING
SOLUBILITY
STAINLESS STEELS
TANTALUM COMPOUNDS
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