Ruiping Liu et al 2009 J. Phys.: Condens. Matter 21 345401 doi:10.1088/0953-8984/21/34/345401
The Peierls stress of the moving 
screw dislocation in Ta*
Ruiping Liu, Shaofeng Wang1 and Xiaozhi Wu
Show affiliationsThe Peierls stress of the moving screw dislocation with a planar and non-dissociated core structure in Ta has been calculated. The elastic strain energy which is associated with the discrete effect of the lattice and ignored in classical Peierls–Nabarro (P–N) theory has been taken into account in calculating the Peierls stress, and it can make the Peierls stress become smaller. The Peierls stress we obtain is very close to the experimental data. As shown in the numerical calculations and atomistic simulations, the core structure of the screw dislocation undergoes significant changes under the explicit stress before the screw dislocation moves. Moreover, the mechanism of the screw dislocation is revealed by our results and the experimental data that the screw dislocation retracts its extension in three {110} planes and transforms its dissociated core structure into a planar configuration. Therefore, the core structure of the moving screw dislocation in Ta is proposed to be planar.
- Footnote
- PACS
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61.72.Bb Theories and models of crystal defects
81.40.Jj Elasticity and anelasticity, stress-strain relations
- Subjects
- Dates
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Issue 34 (26 August 2009)
Received 19 January 2009, in final form 14 June 2009
Published 28 July 2009
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The Peierls stress of the moving screw dislocation in Ta
Ruiping Liu et al 2009 J. Phys.: Condens. Matter 21 345401
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