| Titre : | Plastic deformation mechanism of ultra-fine-grained AA6063 processed by equal-channel angular pressing (2011) |
| Auteurs : | Tao Qian, Auteur ; Michael Marx, Auteur ; Kerstin Schüler, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 58 N° 6, Avril 2010) |
| Article en page(s) : | pp. 2112–2123 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | UFG material ECAP Backscatter contrast Electron backscatter diffraction Scanning TEM |
| Résumé : | Equal-channel angular pressing (ECAP) is an established method to produce ultra-fine-grained (UFG) materials with extraordinary mechanical properties. However, different methods to characterize the complex microstructure give contradictory results. Therefore an ECAP-processed UFG aluminum alloy AA6063 was characterized by various electron-microscopy-based methods such as backscattered electron contrast, electron backscatter diffraction, transmission electron microscopy and low-voltage scanning transmission electron microscopy. Only a skilful combination of all methods reveals the complete information about the microstructure which is needed to understand the results of the mechanical testing by nanoindentation, tensile tests and strain-rate jump test. The main difference is the amount of low-angle grain boundaries and high-angle grain boundaries which determine hardness, tensile and yield strength and strain-rate sensitivity of ECAP materials produced by different numbers of passes and routes. This is explained by the interaction of dislocations with the different grain boundaries. |
| DEWEY : | 669 |
| ISSN : | 1359-6454 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S1359645409008325 |
