Deformation modelling in NaCl at intermediate and elevated temperatures

Conference · Tue Dec 30 04:00:00 EST 1980

OSTI ID:6876802

Arieli, A; Heard, H C; Mukherjee, A K

The flow stress dependence on temperature and strain rate of annealed, isotropic polycrystalline NaCl has been determined at temperatures of 296 to 673/sup 0/K (0.28 to 0.63 T/sub M/) and strain rates of 10/sup -1/ to 10/sup -8/s/sup -1/. At elevated temperatures (T > approx. 0.44 T/sub M/) and relatively low stress the Na/sup +/ diffusion-controlled climb of dislocations was found to be the rate-controlling deformation mechanism and the experimental data could be fitted by a power-law function. In the same range of temperatures, at high stresses the deformation process is controlled by dislocation climb creep due to Cl/sup -/ ion diffusion. At intermediate temperatures and low strain rates and at elevated temperatures and high strain rates the deformation was rate-controlled by the lattice resistance to the dislocation glide motion (Peierls mechanism). The constitutive equations for each deformation mechanism as well as that for the transition from one deformation mechanism to another were developed in terms of strain rate, temperature, and stress.

• Research Organization: California Univ., Davis (USA). Dept. of Mechanical Engineering; California Univ., Livermore (USA). Lawrence Livermore National Lab.
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6876802
• Report Number(s): UCRL-85066; CONF-801148-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL STRUCTURE
DEFORMATION
HALIDES
HALOGEN COMPOUNDS
SODIUM CHLORIDES
SODIUM COMPOUNDS
STRAINS
STRESSES
TEMPERATURE DEPENDENCE