|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Role of Grain Boundary Sliding in Deformation of Polycrystalline Materials
||Ajey Venkataraman, Marissa Linne, Samantha Daly, Michael Sangid
|On-Site Speaker (Planned)
Grain boundary sliding (GBS) is an important deformation mechanism that is known to be activated at high temperatures, low strain rates and small grain sizes. While crystalline slip has been extensively studied, GBS is relatively less understood, and has been mostly restricted to nanocrystalline materials and high-temperature loading. In this study, crystalline slip and GBS are modeled as coupled deformation mechanisms using crystal plasticity simulations within a finite element framework. Distinct flow and hardening laws are assigned to the grain “core” and “mantle” in FCC materials. The grain core accommodates dislocation glide and the mantle accommodates sliding in addition to glide. The constitutive response for our model is compared to full-field strain response experimentally obtained at the microscale-level. The effects of grain mantle width and grain sizes are studied. These results will help improve the sophistication and accuracy of deformation modeling and significantly advance the fundamental knowledge of material behavior.