Size effects in aluminium alloy castings / Q.G. Wang in Acta materialia, Vol. 58 N° 8 (Mai 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3006–3013 Titre : Size effects in aluminium alloy castings Type de document : texte imprimé Auteurs : Q.G. Wang, Auteur ; M. Praud, Auteur ; A. Needleman, Auteur Année de publication : 2011 Article en page(s) : pp. 3006–3013 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Al castings Hall–Petch Dendrite arm spacing Discrete dislocations Résumé : A finding by Benzerga et al. (Acta Mater 2001; 49:3071) that the yield strength of Al–7Si–0.3Mg castings is smaller for castings with a fine secondary dendrite arm spacing (SDAS) than for those with a coarse SDAS is revisited. Previous experimental data for Al–Si–Mg castings are reviewed, and new experiments carried out, both on the original castings used in Benzerga et al. and on Al–Si binary alloy castings whose microstructures more closely conform to the theoretical model of Benzerga et al. The experimental results show that the inverse size effect reported by Benzerga et al. was a consequence of different heat-treatments applied to the original castings, rather than to any intrinsic size effect. The present results confirm that there is a negligibly small size effect in both heat-treatable (Al–Si–Mg) and non-heat-treatable (Al–Si) castings. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000467 [article] Size effects in aluminium alloy castings [texte imprimé] / Q.G. Wang, Auteur ; M. Praud, Auteur ; A. Needleman, Auteur . - 2011 . - pp. 3006–3013. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3006–3013 Mots-clés : Al castings Hall–Petch Dendrite arm spacing Discrete dislocations Résumé : A finding by Benzerga et al. (Acta Mater 2001; 49:3071) that the yield strength of Al–7Si–0.3Mg castings is smaller for castings with a fine secondary dendrite arm spacing (SDAS) than for those with a coarse SDAS is revisited. Previous experimental data for Al–Si–Mg castings are reviewed, and new experiments carried out, both on the original castings used in Benzerga et al. and on Al–Si binary alloy castings whose microstructures more closely conform to the theoretical model of Benzerga et al. The experimental results show that the inverse size effect reported by Benzerga et al. was a consequence of different heat-treatments applied to the original castings, rather than to any intrinsic size effect. The present results confirm that there is a negligibly small size effect in both heat-treatable (Al–Si–Mg) and non-heat-treatable (Al–Si) castings. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000467

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