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Abstract A unified dislocation-based model is proposed in the present work to quantitatively predict the stress-strain behavior of various face-centered cubic (FCC) and body-centered cubic (BCC) metals with grain sizes… Click to show full abstract
Abstract A unified dislocation-based model is proposed in the present work to quantitatively predict the stress-strain behavior of various face-centered cubic (FCC) and body-centered cubic (BCC) metals with grain sizes ranging from submicron to microns. The effect of grain boundary dynamic recovery (GB-DRV) on the evolution of dislocation density was considered in the model. The presence of Luders strain in metals with submicron grain size is well predicted by the model. Furthermore, the present model can explain well the poor tensile ductility of ultrafine-grained metals in terms of dislocation-based mechanisms.
Journal Title: Computational Materials Science
Year Published: 2017
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