Effect of the Grain Size and Distribution of Nanograins on the Deformation of Nanodomained Heterogeneous Nickel
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.
T. Chen and C. Zhou, "Effect of the Grain Size and Distribution of Nanograins on the Deformation of Nanodomained Heterogeneous Nickel," Materials Letters, vol. 236, pp. 661 - 664, Elsevier B.V., Feb 2019.
The definitive version is available at https://doi.org/10.1016/j.matlet.2018.11.045
Materials Science and Engineering
Keywords and Phrases
Crystal plasticity; Finite element model; Nanocrystalline; Nanodomain
International Standard Serial Number (ISSN)
Article - Journal
© 2019 Elsevier B.V., All rights reserved.
01 Feb 2019
This work was supported by NSF CAREER Award (CMMI-1652662). C.Z. also acknowledges support by the XSEDE Award (DMR170093).