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Crystal plasticity modeling the deformation in nanodomained heterogenous structures

Published online by Cambridge University Press:  06 March 2019

Tianju Chen Open the ORCID record for Tianju Chen [Opens in a new window]  and
Caizhi Zhou
Tianju Chen
Affiliation:
Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
Caizhi Zhou*
Affiliation:
Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
*
a)Address all correspondence to this author. e-mail: zhouc@mst.edu
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Abstract

Nanodomained heterogenous structures characterized by randomly dispersed nanograins (NGs) embedded in the coarser grains (CGs) have demonstrated an exciting potential to break the strength–ductility trade-off, providing high strength without the loss of ductility. Here, using a combination of discrete crystal plasticity finite element (discrete-CPFE) model and dislocation density-based CPFE model, we study the effects of grain size, volume fraction of nanograins on the strength and deformation in nanodomained materials. Our analysis shows that the overall flow stresses of nanodomained samples are equal or higher than the strengths predicted by rule of mixtures. Smaller NGs or higher volume fraction of NGs can make the nanodomained samples stronger, as they can be more effective to promote the dislocation accumulations inside the CGs and eventually raise the critical resolved shear stress for each slip system during the plastic flow. Areas surrounding NGs stored higher dislocation densities and less plastic strain, due to the restricted dislocation motion. Furthermore, NGs grain embedded in the CGs can effectively reduce the anisotropy of strength in the nanodomained samples.

Keywords

nanodomaingrain sizecrystal plasticitynanocrystallinefinite element model
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 9: Focus Issue: Plasticity and Fracture at the Nanoscales - Advances in in situ Experimentation Techniques Enabling Novel and Extreme Materials/Nanocomposite Design , 14 May 2019 , pp. 1555 - 1563
Copyright
Copyright © Materials Research Society 2019 

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