A PROGRAM OF BASIC RESEARCH ON MECHANICAL PROPERTIES OF REACTOR MATERIALS. Quarterly Progress Report for the Period Ending June 30, 1962

Technical Report · Wed Jul 25 04:00:00 EDT 1962

DOI:https://doi.org/10.2172/4767920· OSTI ID:4767920

Trozera, T. A.; Flynn, P. W.; Chambers, R. H.; White, J. L.

The effect of modifying the dislocation structure by room-temperature prestraining on the subsequent yielding behavior at 77 deg K is being studied. Results on tantalum single crystals indicated that a considerable decrease in the early yield stress for a given strain is effected by prestraining at room temperature. Twinning was observed in the tantalum at 77 deg K and normal rates of strain. It is shown that the potential barrler to dislocation motion in crystalline solids can be measured in relatively pure bcc transition metals such as Nb, Ta, Mo, and W. Work is being carried out to extend the method of differential calorimetry to measurements of stored-energy-release spectra in deformed bcc metals. Measurements for copper are discussed. (M.C.G.)

• Research Organization: General Atomic Div. General Dynamics Corp., San Diego, Calif.
• DOE Contract Number: AT(04-3)-167
• NSA Number: NSA-16-030784
• OSTI ID: 4767920
• Report Number(s): GA-3376
• Country of Publication: United States
• Language: English

Related Subjects

BARRIERS
CALORIMETERS
COPPER
CRYSTALS
DEFECTS
DEFORMATION
DISLOCATIONS
ENERGY
LATTICES
LOW TEMPERATURE
MEASURED VALUES
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
MONOCRYSTALS
NIOBIUM
SOLIDS
SPECTRA
STRESSES
TANTALUM
TEMPERATURE
TUNGSTEN
TWINNING