Role of Grain Boundary Sliding in Texture Evolution for Nanoplasticity

• Published in: Advanced engineering materials Vol. 20; no. 4
• Main Authors: Zhao, Yajun, Toth, Laszlo S., Massion, Roxane, Skrotzki, Werner
• Format: Journal Article
• Language: English
• Published: Wiley 01.04.2018
• Subjects: Engineering Sciences; Grain Boundary Sliding; Nanoplasticity; Polycrystal Modeling; Texture Evolution
• ISSN: 1438-1656; 1527-2648
• DOI: 10.1002/adem.201700212

A new crystal plasticity model is presented to account for the effect of grain boundary sliding (GBS) on texture evolution during large plastic deformation of nanocrystalline materials. In the model, 12 grain boundaries are assigned for each grain and their sliding rates are calculated using Newtonian viscoplasticity. The lattice rotation of the grain interior is computed by taking into account the deformation field modification produced by GBS. The model is employed for predicting the texture evolution in a nanocrystalline Pd–10 at%Au alloy subjected to large strain simple shear, up to a shear strain of 16.8. Two main texture effects due to increasing GBS are identified: high reduction in texture intensity, and tilts of the texture components from their ideal orientations. In the alloy considered, the contribution of GBS to the total strain is identified to be about 30%. A new crystal‐plasticity model is proposed to study the effect of grain boundary sliding (GBS) on texture evolution for nanocrystalline materials under large plastic deformation. The GBs for each grain are modeled by flat planes, constructing a polyhedron (shown in the figure). Quantitatively, the role of GBS in texture evolution is found: the randomization of texture and the tilts of the texture components from their ideal positions.