Modeling the mechanical response of polycrystals deforming by climb and glide

Abstract

This paper presents a crystallographically-based constitutive model of a single crystal deforming by climb and glide. The proposed constitutive law is an extension of the rate-sensitivity approach for single crystal plasticity by dislocation glide. Based on this description at single crystal level, a homogenization-based polycrystal model for aggregates deforming in a climb-controlled thermal creep regime is developed. To illustrate the capabilities of the proposed model, we present calculations of effective behavior of olivine and texture evolution of aluminum at warm temperature and low strain rate. In both cases, the addition of climb as a complementary single-crystal deformation mechanism improves the polycrystal model predictions.

Keywords:

• constitutive equations
• creep
• micromechanics
• plasticity of crystals
• texture

Acknowledgements

This work was supported by Nuclear Energy Advanced Modeling and Simulation (NEAMS) under the Advance Fuel Cycle Initiative (AFCI) Program, Project #LA0915010909 (USA). OC acknowledges partial funding from ANR-08-BLAN-00238-02 (France). The authors wish to thank John Hirth and Tom Arsenlis for fruitful discussions.