AN EVALUATION OF THE ROLE OF DEFORMATION TWINNING IN THE PLASTIC DEFORMATION OF ZIRCONIUM. Third Quarterly Progress Report

Technical Report · Sun Apr 01 04:00:00 EST 1962

OSTI ID:4781005

Reed-Hill, R E

Twinning in tensile specimens of both pure zirconium and Zircaloy-2 deformed at 77 deg K is much more complicated than at room temperature. At ambient temperatures the major deformation modes are prism slip and {1012} twinning. At 77 deg K {1121} becomes another major mode. Second order twinning or twinning inside twins is a phestudy of the second order twinning deformation in {1012} twins of pure zirconium was made. Zig-zag or crosstwinning in zirconium was also analyzed and found to involve {1121} twins. Room temperature measurements of the volume fraction twinned were made for both zirconium and Zircaloy-2 tensile and creep specimens. The measurements show that in all cases the amount of twinning increases with the overall strain usually in direct proportion (strains less than 10%). Room temperature creep data are given for both zirconiurn and Zircaloy-2. The data show that the creep rate is a sensitive function of the specimen orientation. (auth)

• Research Organization: Florida. Univ., Gainesville. Engineering and Industrial Experiment Station
• NSA Number: NSA-16-030804
• OSTI ID: 4781005
• Report Number(s): TID-15640
• Country of Publication: United States
• Language: English

Related Subjects

CONFIGURATION
CREEP
DEFORMATION
DUCTILITY
IMPURITIES
LATTICES
LOW TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
SLIP
TEMPERATURE
TENSILE PROPERTIES
TWINNING
ZIRCALOY
ZIRCONIUM