A universal relation for the stress dependence of activation energy for slip in body-centered cubic crystals

Journal of Applied Physics

Volumn 86, Issue 3, 1999, Pages 1236-1244

  Ngan, A H W ^a   Zhang, H F ^a,b  

^a UNIVERSITY OF HONG KONG   (Hong Kong)

^b CENTRAL IRON AND STEEL RESEARCH INSTITUTE   (China)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0006205829     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.370877     Document Type: Article

References (20)

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14. A. H. W. Ngan, Physica A (to be published).
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20. The γ surfaces for VB metals are found to be sinusoidal-like with a small plateau at the top. The existence of the sixfold core in these metals is highly plausible from the Peierls-Nabarro model point of view, as the analysis by Ngan (Refs. 15 and 16) suggests that higher fold symmetry is more favorable because it helps spread the strain more effectively from the dislocation center. For group VIB metals (Cr, Mo, W), Duesbury and Vitek (Ref. 19) found that the γ surface has a shoulder at the b/3 position, and this is a factor favoring the stabilization of the threefold core. This may well be the reason for the exhibition of the threefold core in other Fe-like materials. Detailed P-N analysis of the effect of the shape of γ surface on the ground state core configuration is underway.