Transition behaviour of deformation mode from shearing to looping in Al‒Li single crystals
| Autor: | Joong Keun Park, Sm Jeon |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Shearing (physics)
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Alloy Metals and Alloys engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Condensed Matter::Materials Science Crystallography Boundary energy Planar Optical microscope Transmission electron microscopy law engineering General Materials Science Particle size |
| Zdroj: | Philosophical Magazine A. 70:493-504 |
| ISSN: | 1460-6992 0141-8610 |
| Popis: | The transition behaviour of deformation mode from particle shearing to looping has been investigated in the Al-Li alloy single crystals using optical microscopy, transmission electron microscopy and mechanical testing. The observation of slip-line morphology and of dislocation structures indicated the occurrence of a transition of deformation mode from particle shearing to by passing by Orowan looping. The loop size measurements suggested that the critical loop size is close to the average planar particle size at the onset of the peak-ageing condition. The antiphase boundary energy is calculated to be about 0·100 Jm−2 from the analysis of this transition behaviour. This is smaller than that expected from the observed dislocation pair spacings. The similar analysis of ageing curves of polycrystals containing Zr tends to show a higher antiphase boundary energy. This is because the peak-ageing condition appears relatively rapidly owing to a bimodal size distribution of δ′ particles in these crystals... |
| Databáze: | OpenAIRE |
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