Characterization of planar features in Mg–Y–Zn alloys / Y.M. Zhu in Acta materialia, Vol. 58 N° 2 (Janvier 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 464-475 Titre : Characterization of planar features in Mg–Y–Zn alloys Type de document : texte imprimé Auteurs : Y.M. Zhu, Auteur ; A.J. Morton, Auteur ; M. Weyland, Auteur Article en page(s) : pp. 464-475 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Magnesium alloys Precipitates Stacking faults Dislocations HAADF-STEM Index. décimale : 669 Métallurgie Résumé : The planar features in a Mg–8Y–2Zn–0.6Zr (wt.%) alloy solution-treated at 500°C for 1 h have been examined using conventional transmission electron microscopy and atomic-resolution high-angle annular dark-field scanning transmission electron microscopy. Three types of planar features are detected in the microstructure. The first type, which was previously reported to be an intrinsic stacking fault I1 bounded by a Frank partial dislocation, is shown to be the 14H precipitate phase that is associated with Shockley partial dislocations. The second type is also a precipitate phase that has a single unit cell height and is associated with Shockley partial dislocations. The third type of planar feature comprises small ribbon-like stacking faults. These stacking faults are determined as intrinsic I2 type bounded by two Shockley partial dislocations, which is further confirmed by computer simulation. The stacking fault energy associated with the faults is much smaller than that of pure magnesium. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Characterization of planar features in Mg–Y–Zn alloys [texte imprimé] / Y.M. Zhu, Auteur ; A.J. Morton, Auteur ; M. Weyland, Auteur . - pp. 464-475. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 464-475 Mots-clés : Magnesium alloys Precipitates Stacking faults Dislocations HAADF-STEM Index. décimale : 669 Métallurgie Résumé : The planar features in a Mg–8Y–2Zn–0.6Zr (wt.%) alloy solution-treated at 500°C for 1 h have been examined using conventional transmission electron microscopy and atomic-resolution high-angle annular dark-field scanning transmission electron microscopy. Three types of planar features are detected in the microstructure. The first type, which was previously reported to be an intrinsic stacking fault I1 bounded by a Frank partial dislocation, is shown to be the 14H precipitate phase that is associated with Shockley partial dislocations. The second type is also a precipitate phase that has a single unit cell height and is associated with Shockley partial dislocations. The third type of planar feature comprises small ribbon-like stacking faults. These stacking faults are determined as intrinsic I2 type bounded by two Shockley partial dislocations, which is further confirmed by computer simulation. The stacking fault energy associated with the faults is much smaller than that of pure magnesium. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]

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