期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 37, 期 -, 页码 16-30出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2012.03.012
关键词
Dislocations; Texture; Microstructures; polycrystalline material; Crystal Plasticity
资金
- US Department of Energys National Nuclear Security Administration [DE-AC04-94AL85000]
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. (C) 2012 Elsevier Ltd. All rights reserved.
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