TY - JOUR
T1 - A constitutive model of nanocrystalline metals based on competing grain boundary and grain interior deformation mechanisms
AU - Gurses, Ercan
AU - El Sayed, Tamer S.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was fully funded by the KAUST baseline fund.
PY - 2011/12
Y1 - 2011/12
N2 - In this work, a viscoplastic constitutive model for nanocrystalline metals is presented. The model is based on competing grain boundary and grain interior deformation mechanisms. In particular, inelastic deformations caused by grain boundary diffusion, grain boundary sliding and dislocation activities are considered. Effects of pressure on the grain boundary diffusion and sliding mechanisms are taken into account. Furthermore, the influence of grain size distribution on macroscopic response is studied. The model is shown to capture the fundamental mechanical characteristics of nanocrystalline metals. These include grain size dependence of the strength, i.e., both the traditional and the inverse Hall-Petch effects, the tension-compression asymmetry and the enhanced rate sensitivity. © 2011 Elsevier B.V. All rights reserved.
AB - In this work, a viscoplastic constitutive model for nanocrystalline metals is presented. The model is based on competing grain boundary and grain interior deformation mechanisms. In particular, inelastic deformations caused by grain boundary diffusion, grain boundary sliding and dislocation activities are considered. Effects of pressure on the grain boundary diffusion and sliding mechanisms are taken into account. Furthermore, the influence of grain size distribution on macroscopic response is studied. The model is shown to capture the fundamental mechanical characteristics of nanocrystalline metals. These include grain size dependence of the strength, i.e., both the traditional and the inverse Hall-Petch effects, the tension-compression asymmetry and the enhanced rate sensitivity. © 2011 Elsevier B.V. All rights reserved.
UR - http://hdl.handle.net/10754/561934
UR - https://linkinghub.elsevier.com/retrieve/pii/S0167577X11008093
UR - http://www.scopus.com/inward/record.url?scp=80051798565&partnerID=8YFLogxK
U2 - 10.1016/j.matlet.2011.07.039
DO - 10.1016/j.matlet.2011.07.039
M3 - Article
SN - 0167-577X
VL - 65
SP - 3391
EP - 3395
JO - Materials Letters
JF - Materials Letters
IS - 23-24
ER -