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Titre :
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Effect of nano Al (Scx−1Zrx) precipitates on the mechanical and corrosion behavior of Al-2.5 Mg alloys (2011)
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Auteurs :
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Z. Ahmad, Auteur ;
B. J. Abdul Aleem, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Materials and corrosion (Vol. 62 N° 4, Avril 2011)
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Article en page(s) :
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pp. 335–345
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Note générale :
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Génie Mécanique
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Langues :
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Anglais
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Index. décimale :
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620.1 (Essais des matériaux. Défauts des matériaux. Protection des matériaux)
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Tags :
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Al-Mg alloys Electrochemical corrosion Strengthening Nano-precipitates Scandium Grain boundary precipitates
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Résumé :
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Microanalytical, mechanical, and corrosion studies were undertaken to investigate the effect of nano-precipitates of Al(Scx−1Zrx) on the mechanical and corrosion characteristics of Al 2.5 alloy containing 0, 0.15, 0.3, 0.6, and 0.9 wt% of Sc with 0.15 wt% Zr. Addition of 0.3% Sc significantly increased the yield strength due to small precipitates sizes (5–19 nm) and the high coherency of the nano-particles. Largest contributor to the strength was grain boundary strengthening caused by pinning of grain boundary precipitates. The alloys showed a good resistance to corrosion in 3.5 wt% neutral chloride solution. The alloy offered a high passivation tendency because of homogeneous coherent nano Al(Scx−1Zrx) precipitates. The nano precipitates interfaces and homogeneously distributed Al3Sc precipitates offer a high degree of corrosion resistance to Al 2.5 Mg Sc alloys compared to conventional aluminum alloys, such as Al 6061 and Al6013.
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DEWEY :
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620.1
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ISSN :
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0947-5117
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En ligne :
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http://onlinelibrary.wiley.com/doi/10.1002/maco.200905342/abstract
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