Title

Effect of the Grain Size and Distribution of Nanograins on the Deformation of Nanodomained Heterogeneous Nickel

Abstract

We studied the effect of embedded nanograins on the strength and deformation of nanodomained heterogeneous nickel (Ni) via a novel discrete-crystal plasticity model. Nanodomained structures exhibited higher strength than those of heterogeneous lamella structures and rule of mixtures. Due to the mismatch of strengths between the nanograins and coarse grains, geometrically necessary dislocations (GND) accumulated around nanograins and increased with the strain. In addition, smaller nanograins are more effective to generate GND in both nanodomained and heterogeneous lamella structures. These findings shed light on the role of dislocation mechanisms in the plasticity of heterogeneous nanostructured metals.

Department(s)

Materials Science and Engineering

Comments

This work was supported by NSF CAREER Award (CMMI-1652662). C.Z. also acknowledges support by the XSEDE Award (DMR170093).

Keywords and Phrases

Crystal plasticity; Finite element model; Nanocrystalline; Nanodomain

International Standard Serial Number (ISSN)

0167-577X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Elsevier B.V., All rights reserved.

Share

 
COinS