Abstract

It has been shown that unlike its constituent nanocrystalline (NC) phase, a heterogeneous lamella (HL) composite comprising NC and coarse-grain layers exhibits greatly improved ductility. To understand the origin of this enhancement, we present a 3D discrete dislocation, crystal plasticity finite element model to study the development of strains across this microstructure. Here we show that the HL structure homogenizes the plastic strains in the NC layer, weakening the effect of strain concentrations. These findings can provide valuable insight into the effects of material length scales on material instabilities, which is needed to design heterogeneous structures with superior properties.

Department(s)

Materials Science and Engineering

Comments

This work was supported by the grants from The University of Missouri Research Board. C.Z. is also grateful for the partial support provided by Materials Research Center at Missouri University of Science and Technology.

Keywords and Phrases

Dislocations; Heterogeneous; Instability; Statistics; Strain Gradients

International Standard Serial Number (ISSN)

2166-3831

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2017 The Authors, All rights reserved.

Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

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