Enhanced gradient crystal-plasticity study of size effects in a β-titanium alloy. (16th March 2017)

• Record Type: Journal Article
• Authors: Demiral, Murat; Nowag, Kai; Roy, Anish; Ghisleni, Rudy; Michler, Johann; Silberschmidt, Vadim V
• Is Part Of: Modelling and simulation in materials science and engineering. Volume 25:Number 3(2017)
• Publication Date: 2017-03-16
• Subjects: strain gradient plasticity -- size effect -- single crystal -- titanium alloy -- micropillar compression; Materials -- Mathematical models -- Periodicals; Matériaux -- Modèles mathématiques -- Périodiques; Materials -- Mathematical models; Periodicals; 620.00113
• DOI: 10.1088/1361-651X/aa5ce3
• Languages: English
• ISSNs: 0965-0393

Abstract

Abstract: A calibrated model of enhanced strain-gradient crystal plasticity is proposed, which is shown to characterize adequate deformation behaviour of bcc single crystals of a β -Ti alloy (Ti-15-3-3-3). In this model, in addition to strain gradients evolving in the course of deformation, incipient strain gradients, related to a component's surface-to-volume ratio, is accounted for. Predictive capabilities of the model in characterizing a size effect in an initial yield and a work-hardening rate in small-scale components is demonstrated. The characteristic length-scale, i.e. the component's dimensions below which the size effect is observed, was found to depend on densities of polar and statistical dislocations and interaction between them.