Modelling deformation and recrystallization textures in calcite

A self-consistent polycrystal plasticity theory is applied to model the deformation and recrystallization behavior of rhombohedral calcite. In this mineral deformation occurs by slip and twinning and in experimentally deformed aggregates a strong crystallographic texture develops. Whereas the Taylor theory has failed to model axial compression, the self-consistent theory automatically introduces heterogeneous deformation by curling and simulates the correct texture. A deformation-based recrystallization model, that balances growth and nucleation, predicts a so far enigmatic high temperature texture. Aspects of mechanical twinning are also discussed. Many of the conclusions are directly applicable to other low-symmetry materials, especially hexagonal metals. (C) 1998 Acta Metallurgica Inc.