A PROGRAM OF BASIC RESEARCH ON MECHANICAL PROPERTIES OF REACTOR MATERIALS. Quarterly Progress Report for the Period Ending June 30, 1963

Technical Report · Fri Aug 30 04:00:00 EDT 1963

DOI:https://doi.org/10.2172/4636245· OSTI ID:4636245

Trozera, T A; Chambers, R H; Stoneburner, D F; White, J L

Deformation Mechanisms in BCC Metals. Thin-film microscopic observations are presented for rolled single TA crystals. These observations show numerous areas almost devoid of slip markings. One specimen was annealed in air at 400 deg C to pin all the dislocations; transmission micrography of the annealed specimen indicates a quite low temperature for dialocation rearrangements. A correlation was found between the temperatures of the stages in the amplitude-dependent modulus defect and the deformation-peak temperatures for Nb. It is concluded that much inore extensive dislocation motion is possihle for a given applied stress amplitude at temperatures above the alpha peak than below, and that limited dislocation motion is possible at very low temperatures if the applied stress is great enough. Stored-Energy Release in Deformed Metals. Stored-energy-release measurements were made on Puron and Ferrovac E grades of pure Fe for several grain sizes and strain levels. The results indicate that the stored energies and dislocation densities in Fe are much smaller than in Cu and other metals. (D.L.C.)

• Research Organization: General Atomic Div. General Dynamics Corp., San Diego, Calif.
• DOE Contract Number: AT(04-3)-167
• NSA Number: NSA-17-037508
• OSTI ID: 4636245
• Report Number(s): GA-4495
• Country of Publication: United States
• Language: English

Related Subjects

AIR
ANNEALING
COPPER
CRYSTALS
DEFECTS
DEFORMATION
DISLOCATIONS
ENERGY
FILMS
GRAIN SIZE
IMPURITIES
IRON
LATTICES
MEASURED VALUES
MECHANICAL STRUCTURES
METALS
METALS, CERAMICS, AND OTHER MATERIALS
MICROSCOPY
MONOCRYSTALS
MOTION
NIOBIUM
REACTORS
ROLLING
STANDARDS
STORAGE
TEMPERATURE
THICKNESS