TECHNICAL PROGRESS REPORT FOR THE PERIOD JULY THROUGH SEPTEMBER 1953

Technical Report · Tue Nov 24 04:00:00 EST 1953

OSTI ID:4328476

Bend tests have revealed that beryllium sheet can be made by cross rolling of extruded powder flats which has high ductility in two directions in the plane of the sheet. Direct experiment has shown that nitrogen will penetrate much into a bed of hot beryllium powder than does carbon monoxide. Extensive thermal cycling tests have shown that the growth per cycle is smallest at the front end of an alpha extruded bar of uraniuun and increases uniformly toward the back end. The coarse grains sometimes produced by alpha extrusion occur first at the leading end of the bar and at the surface. The coarse grains ahow much less cycling growth than the fine grains. Corrosion testing of epsilon uraniumsilicon alloy is in progress. Zirconium appears to scavenge carbon and nitrogen from molten uranium through flotation of carbides and nitrides. Zirconium is relatively resistant to molten U-Cr alloy. A fairly successful radiator casting was made with zirconium tubes which were in contact with U- Cr at 1000 deg C for five minutes. An extensive report on recrystallization of crystal bar zirconium as a function of percentage reduction and of annealing temperature for different lengths of time is given, Zirconium cladding of graphite by dipping in molten zirconium has given some promising results. It has been shown that the corrosion resistance of Bureau of Mines zirconium is reduced by quenching from temperatures in the vicinity of the alpha-beta transformation. Chromium from the Bureau of Mines was extruded at 1900 deg F. All tests to date have shown that it is brittle at room temperature. (auth)

• Research Organization: Massachusetts Inst. of Tech., Cambridge. Metallurgical Project
• NSA Number: NSA-12-001991
• OSTI ID: 4328476
• Report Number(s): MIT-1114
• Country of Publication: United States
• Language: English

Related Subjects

ADSORPTION
ALLOTROPY
ANNEALING
BERYLLIUM
BRITTLENESS
CARBIDES
CARBON MONOXIDE
CASTING
CHROMIUM
CHROMIUM ALLOYS
COATING
COOLING
CORROSION
CRYSTALS
DUCTILITY
EXTRUSION
FLOTATION
GRAIN SIZE
GRAPHITE
HEAT EXCHANGERS
HIGH TEMPERATURE
LIQUID METALS
MATERIALS TESTING
MINERALOGY, METALLURGY, AND CERAMICS
NITRIDES
NITROGEN
POWDERS
RECRYSTALLIZATION
RODS
ROLLING
SHEETS
SILICIDES
STABILITY
SURFACES
TEMPERATURE
TENSILE PROPERTIES
THERMAL STRESSES
TUBES
URANIUM
URANIUM ALLOYS
URANIUM COMPOUNDS
ZIRCONIUM