Publications

Results 1–25 of 83
Skip to search filters

Incorporating atomistic data of lattice friction into BCC crystal plasticity models

International Journal of Plasticity

Weinberger, Christopher R.; Battaile, Corbett C.; Buchheit, Thomas E.; Holm, Elizabeth A.

Despite the technological importance of body-centered cubic (BCC) metals, models of their plastic deformation are less common than those of face-centered cubic (FCC) metals, due in part to the complexity of slip in BCC crystals caused by the thermal activation of screw dislocation motion. This paper presents a physically based crystal plasticity model that incorporates atomistic models and experimental measurements of the thermally activated nature of screw dislocation motion. This model, therefore, reproduces the temperature, stress, and strain rate dependence of flow in BCC metals in a simple formulation that will allow for large, grain-scale simulations. Furthermore, the results illustrate the importance of correctly representing mechanistic transitions in materials with high lattice friction. © 2012 Elsevier Ltd. All rights reserved.

More Details
TYPE Journal Article YEAR 2012
ScopusOSTI

Recrystallized grain size in single phase materials

Materials Science Forum

Wang, Shengyu; Rollett, Anthony D.; Holm, Elizabeth A.

During large-strain plastic deformation, subgrain structures typically develop within the grains. At large enough equivalent strains above, say 0.5, recrystallization occurs via abnormal coarsening of the subgrain structure or abnormal (sub-) grain growth (AsGG). The fraction of subgrains that develop into new, recrystallized grains has been quantified as a function of texture spread (Grain Reference Orientation Deviation) using Monte Carlo simulation. When this fraction is combined with the known monotonic increase in mean misorientation with strain, the recrystallized grain size can be predicted as a function of von Mises strain. The prediction is in good agreement with experimental results drawn from the literature. © (2012) Trans Tech Publications, Switzerland.

More Details
TYPE Conference YEAR 2012
ScopusOSTI
Results 1–25 of 83
Results 1–25 of 83