Formation of antiphase-domain boundary tubes in B2 ordered alloys by cross-slip and annihilation of screw dislocations
| Autor: | Peter Bernhard Hirsch, P. M. Hazzledine, G. R. Anstis, C. T. Chou |
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| Rok vydání: | 1987 |
| Předmět: |
Annihilation
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics business.industry Alloy Metals and Alloys Cross Slip engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Dipole Optics engineering Partial dislocations General Materials Science Dislocation business Anisotropic elasticity |
| Zdroj: | Philosophical Magazine A. 56:799-813 |
| ISSN: | 1460-6992 0141-8610 |
| DOI: | 10.1080/01418618708204489 |
| Popis: | A detailed analysis of the cross-slip and annihilation of screw dislocations in B2 ordered alloys is carried out using anisotropic elasticity. The paths of the partial dislocations are calculated and it is shown that antiphase-domain boundary tubes with complex structures may be formed by the cross-slip and annihilation of screw dislocation dipoles with a suitable range of heights (e.g. for Fe-30 at.% A1 alloy from 70 to 200 A). APB tubes thus formed usually have a height of a few multiples of the elementary jog height, and widths of 7–50A in agreement with experiment. Image calculations (including the effects of the limited aperture, defocus and the lens aberration) for APB tubes with a complex cross-section give a good match with experimental results. The analysis also explains why APB tubes of such small heights are generally connected to edge dislocation dipoles of much larger heights. |
| Databáze: | OpenAIRE |
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