Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 66, Issue -, Pages 16-31Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2014.01.006
Keywords
Dislocations; Texture; Interfaces; Crystal plasticity; Finite elements; Accumulative roll bonding
Funding
- University of New Hampshire
- Los Alamos National Laboratory Directed Research and Development (LDRD) [ER20140348]
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We present a multiscale model for anisotropic, elasto-plastic, rate- and temperature-sensitive deformation of polycrystalline aggregates to large plastic strains. The model accounts for a dislocation-based hardening law for multiple slip modes and links a single-crystal to a polycrystalline response using a crystal plasticity finite element based homogenization. It is capable of predicting local stress and strain fields based on evolving microstructure including the explicit evolution of dislocation density and crystallographic grain reorientation. We apply the model to simulate monotonic mechanical response of a hexagonal close-packed metal, zirconium (Zr), and a body-centered cubic metal, niobium (Nb), and study the texture evolution and deformation mechanisms in a two-phase Zr/Nb layered composite under severe plastic deformation. The model predicts well the texture in both co-deforming phases to very large plastic strains. In addition, it offers insights into the active slip systems underlying texture evolution, indicating that the observed textures develop by a combination of prismatic, pyramidal, and anomalous basal slip in Zr and primarily {110}< 111 > slip and secondly {112}< 111 > slip in Nb. (C) 2014 Elsevier Ltd. All rights reserved.
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