Effects of anisotropy and irradiation on the deformation behavior of Zircaloy 2. Final report

Technical Report · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6170755

Pelloux, R M; Ballinger, R; Lucas, G

An experimental program investigated the effects of texture anisotropy and irradiation on the mechanical behavior of Zircaloy-2. Short time and time dependent mechanical behavior were considered. Irradiation effects were simulated through the use of 4.75 MeV protons. The temperature ranges investigated were 298/sup 0/K and 573 to 673/sup 0/K. Both cold worked-stress relieved and annealed material were used in this experimental program. Short time yield behavior of different crystallographic textures was determined by uniaxial and plane strain tests in the temperature range 298/sup 0/K and 573 to 673/sup 0/K. Monotonic flow loci were constructed for each texture. Yield behavior is a strong function of the crystallographic texture number f at all temperatures investigated. The rotation of texture with increasing plastic strain was investigated as a function of initial texture at 298/sup 0/K and 623/sup 0/K. The rate of texture rotation df/epsilon/sub p/ was found to be a unique function of the initial texture for plastic strains less than 0.08. Time dependent mechanical behavior was investigated in the range 573 to 673/sup 0/K using constant load creep and stress relaxation tests. The tensile creep strength is proportional to the resolved fraction of basal poles in the test direction. In variable stress and temperature tests, the time-hardening rule was found to be inapplicable. The strain-hardening rule was applied with success to data obtained at temperatures less than or equal to 648/sup 0/K. Irradiation creep tests were conducted in vacuum at 598/sup 0/K and 102 to 241 MPa on 80..mu..m thick Zircaloy-2 foil specimens in both the recrystallized and cold worked-stress relieved condition. In the irradiation creep tests irradiation hardening and enhanced irradiation creep were observed. Radiation hardening effects were significant in annealed material but were attenuated in cold worked-stress relieved material.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA)
• OSTI ID: 6170755
• Report Number(s): EPRI-NP-982
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360106* -- Metals & Alloys-- Radiation Effects
AGING
ALLOYS
ANISOTROPY
ANNEALING
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
CREEP
CRYSTAL STRUCTURE
DEFORMATION
FRICTION
HARDENING
HEAT TREATMENTS
IRON ADDITIONS
IRON ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
STRESS ANALYSIS
TEMPERATURE EFFECTS
TENSILE PROPERTIES
TIME DEPENDENCE
TIN ALLOYS
YIELD STRENGTH
ZIRCALOY
ZIRCALOY 2
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS