FUNDAMENTAL AND APPLIED RESEARCH AND DEVELOPMENT IN METALLURGY. Progress Report to United States Atomic Energy Commission, March 1963

Technical Report · Tue May 28 00:00:00 EDT 1963

OSTI ID:4714365

Zone-refining of a silicon-doped crystal was completed. Resistance ratios were measured on specimens from a 12-pass zone-refined crystal. A rather large drop in resistance ratio (1300 to 750) was observed near the start end of the crystal. A tensile test was performed on a sample from this crystal oriented for basal slip. The results show that additional zone-reflning passes did not lower the CRSS for basal slip. Three compression test samples were machined from 6- and 7-pass crystals of intermediate purity levels, and resistance ratio data were obtained on them. An attempt was made to establish rolling temperatures for Nb --Re alloys, and tensile test specimens of the rolled alloy were prepared. An attempt was also made to develop cold-rolling schedules for Ta-Ru alloys. The tensile properties of Ta, Ta --Ru, Ta--W--Zr, Ta--W, and Ta--W --Hf were investigated. The effects of aging and warm working on the properties of U--1.2 wt% Cu SLIS alloy were investigated by hot-hardness and metallographic techniques, Warm working raised the hardness level at temperatures up to 4000 deg C, but produced no beneficial effects at higher temperatures. The 600 deg aging treatment had less effect than warm working, actually lowering the 300 and 400 deg C hardness slightly. Development of etching techniques for U-Cu alloys was begun. Development of fabrication techniques for seamless high quality tubing of W and W--Re alloys (0.375-in. diameter and 0.030-in. wall) was continued. Tubing was extruded using Fe and Mo outer cans and Mo cores containing graphite cores. Tubing was also produced by extrusion at 1200 deg C, annealing at 1450 deg C, and subsequent drawing. Hardness tests showed that the annealing at 1450 deg caused a definite softening of the material. W extruded at 1200 deg C could be bent to a 90 deg angle at 370 and 535 deg C, while a specimen anneaied at 1450 deg C was bent at 230 deg C with fracture occurring oniy near 90 deg . Metallographic examination showed that annealing for one hour at 1000 deg C produced very little effect, while at 1200 deg C some grain growth was observed. Annealing at 1400 and 1480 deg C produced considerable recrystallization. (D.C.W.)

• Research Organization: Nuclear Metals, Inc., Concord, Mass.
• DOE Contract Number: AT(30-1)-2784
• NSA Number: NSA-17-027733
• OSTI ID: 4714365
• Report Number(s): NMI-2116
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: United States
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ANNEALING
CANNING
COLD WORKING
COPPER ALLOYS
DUCTILITY
ELECTRIC CONDUCTIVITY
ETCHING
EXTRUSION
FABRICATION
FAILURES
GRAIN SIZE
GRAPHITE
HAFNIUM ALLOYS
HARDNESS
HEAT TREATMENTS
HOT WORKING
IRON
MECHANICAL PROPERTIES
METALLOGRAPHY
MOLYBDENUM
MONOCRYSTALS
NIOBIUM ALLOYS
RECRYSTALLIZATION
REFINING
REPORT
RHENIUM ALLOYS
ROLLING
RUTHENIUM ALLOYS
SILICON
TANTALUM
TANTALUM ALLOYS
TEMPERATURE
TENSILE PROPERTIES
TUBES
TUNGSTEN
TUNGSTEN ALLOYS
URANIUM ALLOYS
ZIRCONIUM ALLOYS