| Titre : | α- to γ-Al2O3 martensitic transformation induced by pulsed laser irradiation (2011) |
| Auteurs : | P.F. Yan, Auteur ; M.L. Sui, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 58 N° 11, Juin 2010) |
| Article en page(s) : | pp. 3867–3876 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | Martensitic phase transformation Ceramics High-resolution electron microscopy Twinning Alumina |
| Résumé : | A martensitic transformation from the α to the γ phase of aluminum oxide was observed by transmission electron microscopy (TEM) upon rapid heating induced by pulsed laser irradiation. Two variants possessing a twin relationship were found in the product. High-resolution TEM reveals that the transformation is achieved via the glide of quarter partial dislocations on every other basal plane of α-Al2O3. The high thermal stress caused by pulsed laser irradiation is believed to be the main driving force of the phase transformation. This martensitic transformation is associated with a positive volume change and substantial shear strain. The overall shear strain could be minimized by the self-accommodating variants. These characteristics suggest potential application of the martensitic transformation for transformation toughening in ceramic materials. |
| DEWEY : | 669 |
| ISSN : | 1359-6454 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S135964541000203X |
