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Title:	Incipient Plasticity of Single-Crystal Tantalum as a Function of Temperature and Orientation
Author:	Franke, O.; Alcalá Cabrelles, Jorge; Dalmau, Ramon; Duan, Zhi Chao; Biener, A.; Biener, M. M.; Hodge, A. M.
Other authors:	Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. InSup - Grup de Recerca en Interacció de Superfícies en Bioenginyeria i Ciència dels Materials
Abstract:	The nanocontact plastic behaviour of single-crystalline Ta (1¿0¿0), Ta (1¿1¿0) and Ta (1¿1¿1) was studied as a function of temperature and indentation rate. Tantalum, a representative body centred cubic (BCC) metal, reveals a unique deformation behaviour dominated by twinning and the generation of stacking faults. Experiments performed at room temperature exhibit a single pop-in event, while at 200¿°C, above the critical temperature, a transition to multiple pop-ins was observed. The experimental results are discussed with respect to the orientation as well as temperature and correlated to the defect structures using both anisotropic finite element and MD simulations. The serrated flow observed at 200¿°C is related to differences in the quasi-elastic reloading originating from changes in the defect mechanism
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Enginyeria dels materials -Micromechanics -nanomechanics -tantalum -finite-element modelling -nanoindentation -Assaigs de materials -Micromecànica
Rights:	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Document type:	Article - Submitted version Article
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