Plastically-induced volume deformation of nanocrystalline α-Fe with a <110> columnar structure
Keywords: 
Plastic volume invariance
Plastic volume deformation
Nanocrystalline iron
Molecular dynamics simulations
Size effects
Issue Date: 
2020
Publisher: 
MDPI AG
ISSN: 
2075-4701
Note: 
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Citation: 
Gil-Sevillano, J. (Javier); Aldazabal, J. (Javier); Aldazabal, I. (I.). "Plastically-induced volume deformation of nanocrystalline α-Fe with a <110> columnar structure". Metals. 10 (12), 2020, 1649
Abstract
Volume changes accompanying the plastic deformation at 300 K of nanocrystalline samples of α-Fe with a columnar grain structure possessing a ⟨11̲0⟩ random fiber texture has been obtained from molecular dynamics (MD) simulations. The samples were strained in tension along the common axial direction of the columnar grains. After removal of the elastic volume change, the evolution of plastic volume strain was obtained. Small but non-negligible volume dilations or contractions are observed depending on size (samples of very small grain size show volume contraction). The rate of volume change is high during the first 10% plastic deformation and continues at a low pace thereafter; the first 10% deformation represents a transient in the stress–strain behavior too. The complex behavior observed is reasonably explained by the superposition of contributions from different plastically-induced structural changes to the mass density change: Mainly from changes of grain size, grain boundary structure, dislocation density and density of point-defects. The results are of interest for the development of crystal plasticity theories not restricted by the volume conserving assumption.

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