|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Core Structure of ½<111> Screw Dislocations in Refractory BCC High Entropy Alloys
||Yi-Shen Lin, Vaclav Vitek
|On-Site Speaker (Planned)
Plasticity of BCC metals is governed by ½<111> screw dislocations. Using methods (DFT and TB) that treat pertinently the interatomic bonding in refractory metals (V, Nb, Mo, Ta, W) it has been shown that cores of these dislocations are non-planar but non-degenerate. It is reasonable to assume that in BCC high entropy alloys (HEA) composed of such metals ½<111> screw dislocations will play an analogous role and their cores will be, on average, similar. In this paper we first present empirical EAM-type potentials for a series of BCC transition metals that correctly reproduce non-degenerate non-planar core structures. Atomic interactions in HEAs are then developed based on these EAM-type potentials and used in modeling ½<111> screw dislocations. At this point we focus on the variation of the dislocation core structure along the dislocation line, which may provide a clue for understanding the differences between plastic properties of pure elements and HEAs.
||Planned: Supplemental Proceedings volume