Electronic Selection Rules Controlling Dislocation Glide in bcc Metals

Details Electronic Selection Rules Controlling Dislocation Glide in bcc Metals Electronic Selection Rules Controlling Dislocation Glide in bcc Metals

2008-08-21

arxiv.org/abs/0808.2969v1

Phys. Rev. Lett. 101, 085505 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.101.085505

The validity of the structure-property relationships governing the deformation behavior of bcc metals was brought into question with recent {\it ab initio} density functional studies of isolated screw dislocations in Mo and Ta. These existing relationships were semiclassical in nature, having grown from atomistic investigations of the deformation properties of the groups V and VI transition metals. We find that the correct form for these structure-property relationships is fully quantum mechanical, involving the coupling of electronic states with the strain field at the core of long $a/2<111>$ screw dislocations.

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