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

Technical Report · Sun Jul 01 04:00:00 EDT 1962

OSTI ID:4782587

Reed-Hill, R E

A contractile strain ratio analysis was applied to both zirconium and Zircaloy-2 specimens plastically deformed in tension and creep. The data indicate that the contractile strain ratios are essentially temperature- independent between 20 and 500 deg C and are independent of strain rate variations over a range of three or more orders or magnitude. On this basis, it appears that there may be no significant change in deformation modes within the investigated ranges of temperature and strain-rate. However, 540 deg C tensile specimens show less visible evidence of deformation twinning than do room- temperature specimens. This observed discrepancy in deformation characteristics may be due either to complete twinning of grains or to annealingout of twinned material during relatively slow cooling from the test temperature. Banding in schedule-18 Zircaloy-2 was studied in detail. Unusually large scatter in creeprupture life, creep rate, and contractile strain ratio data, observed with some specimens, may be explained in terms of a corresponding variation in the degree of banding. (auth)

• Research Organization: Florida. Univ., Gainesville. Engineering and Industrial Experiment Station
• NSA Number: NSA-16-030807
• OSTI ID: 4782587
• Report Number(s): TID-16574
• Country of Publication: United States
• Language: English

Related Subjects

ANNEALING
COOLING
CREEP
DEFORMATION
DUCTILITY
FAILURES
GRAIN SIZE
LATTICES
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
STRESSES
TEMPERATURE
TWINNING
VARIATIONS
ZIRCALOY
ZIRCONIUM