THE CHANGES OF MICROSTRUCTURE OF URANIUM BY CYCLIC HEAT TREATMENT

Journal Article · Wed Jun 01 04:00:00 EDT 1960 · Fiz. Tverdogo Tela

OSTI ID:4138658

Garber, R I; Zalivadnyi, S Ya; Mikhailovskii, V M

Metallographic and x-ray diffraction methods were used in studies of the relative displacement and deformation of large-grain, cylindrically shaped uranium crystallites un- der cyclic treatment. The large grain (6 x 0.5 mm) structure was achieved by recrystallization of the polymorphous state: cyclic treatment was carried out at 100 to 600 deg C. A pronounced curvature in the deformation line was observed with a single heating up to 606 deg C, but this line almost straightened out upon cooling to room temperature. The displacement, calculated on the basis of data on crystal inter-orientation and thermal expansion anisotropy. exceeds by a factor of two the experimentally obtained residual displacement of 3 x 10/sup -5/ per cycle. It was found that a considerable portion of the plastic deformation was localized at the boundary. The "thermal ratchet" is complicated by the wedging of adjoining grains. X-ray diffraction revealed that crystallites separate into blocks and subgrains following cyclic thermal treatments. (R.V.J.)

• Research Organization: Khar'kov Inst. of Physics and Tech., Academy of Sciences, Ukrainian SSR
• NSA Number: NSA-14-024597
• OSTI ID: 4138658
• Journal Information: Fiz. Tverdogo Tela, Journal Name: Fiz. Tverdogo Tela Vol. Vol: 2
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ANISOTROPY
CYLINDERS
DEFORMATION
DIFFRACTION
EXPANSION
GRAIN BOUNDARIES
GRAIN SIZE
HEAT TREATMENTS
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
RECRYSTALLIZATION
TEMPERATURE
URANIUM
X RADIATION