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Comparison of residual microstructures associated with impact craters in Al–Sc and Al–Ti alloys / Yicong Ye in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2520–2526 Titre : Comparison of residual microstructures associated with impact craters in Al–Sc and Al–Ti alloys Type de document : texte imprimé Auteurs : Yicong Ye, Auteur ; Peijie Li, Auteur ; L.S. Novikov, Auteur Année de publication : 2011 Article en page(s) : pp. 2520–2526 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Aluminium  alloys  High-speed  impact  Microstructure  Precipitation Résumé : Al–Sc and Al–Ti semi-infinite targets were impacted by high-speed projectiles with velocities of 0.8, 2 and 4 km s−1, respectively. The results show that deep columned craters with hemispherical bottoms were formed in the Al–Ti target, while near-hemispheroidal or relatively shallower craters formed in the Al–Sc alloy. It is concluded that different microstructures of Al–Sc and Al–Ti alloys, including different grain sizes and secondary particles precipitated in the matrix, result in their having greatly different capabilities of resisting impact. Residual microstructures of different samples are further discussed. It is possible that, due to the very large amount of energy imported into the target by high-speed impact, secondary Al3Sc lost its coherency and consequently recrystallization occurred. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008969 [article] Comparison of residual microstructures associated with impact craters in Al–Sc and Al–Ti alloys [texte imprimé] / Yicong Ye, Auteur ; Peijie Li, Auteur ; L.S. Novikov, Auteur . - 2011 . - pp. 2520–2526. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2520–2526 Mots-clés : Aluminium  alloys  High-speed  impact  Microstructure  Precipitation Résumé : Al–Sc and Al–Ti semi-infinite targets were impacted by high-speed projectiles with velocities of 0.8, 2 and 4 km s−1, respectively. The results show that deep columned craters with hemispherical bottoms were formed in the Al–Ti target, while near-hemispheroidal or relatively shallower craters formed in the Al–Sc alloy. It is concluded that different microstructures of Al–Sc and Al–Ti alloys, including different grain sizes and secondary particles precipitated in the matrix, result in their having greatly different capabilities of resisting impact. Residual microstructures of different samples are further discussed. It is possible that, due to the very large amount of energy imported into the target by high-speed impact, secondary Al3Sc lost its coherency and consequently recrystallization occurred. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008969