Skip to Main content Skip to Navigation
Journal articles

$Ab\ initio$ informed yield criterion across body-centered cubic transition metals

Abstract : Plasticity of body-centered cubic (bcc) metals is atypical at low temperatures, caused by the important lattice friction of screw dislocations. In this paper, we present a yield criterion that can be used to predict yield stress and active slip systems in all bcc transition metals for any applied stress. The criterion is fully parametrized on ab initio calculations of screw dislocation glide properties, and is applied in the case of uniaxial loading to compare with tension and compression experiments at low temperature. The criterion describes most of the different plastic behaviors observed experimentally in different metals, i.e. the dependence of the yield stress and active slip system on the orientation of the loading axis, as well as the tension/compression asymmetry. We find that plastic yield generally occurs at lower stresses in tension than in compression but for some metals, in particular niobium, there are large regions of the stereographic projection where compression is easier
Complete list of metadata
Contributor : Contributeur MAP CEA Connect in order to contact the contributor
Submitted on : Tuesday, July 5, 2022 - 1:30:07 PM
Last modification on : Tuesday, September 27, 2022 - 4:30:09 AM


 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2023-01-01

Please log in to resquest access to the document



Baptiste Bienvenu, Lucile Dezerald, David Rodney, Emmanuel Clouet. $Ab\ initio$ informed yield criterion across body-centered cubic transition metals. Acta Materialia, Elsevier, 2022, 236, pp.118098. ⟨10.1016/j.actamat.2022.118098⟩. ⟨cea-03714226⟩



Record views