Intergranular Corrosion and Stress Corrosion Cracking of Sensitised AA5182

Abstract:

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AA5182 (Al-4.5 wt% Mg) can become susceptible to intergranular corrosion (IGC) with time at moderately elevated service temperatures owing to precipitation of Mg-rich β-phase at grain boundaries, which can lead to stress corrosion cracking (SCC). The IGC and SCC susceptibility of AA5182 was found to depend strongly on sensitisation heat treatments. AFM and TEM studies demonstrated that the degree of precipitation and thus susceptibility to attack for a boundary can be related to its crystallographic misorientation. Low angle boundaries (<20°) are most resistant to attack as they do not show β-phase precipitation. However, higher angle boundaries show highly variable precipitation and corrosion susceptibility: critical factors are the grain boundary plane and precipitate/matrix crystallographic relationship.

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd

Pages:

641-646

DOI:

10.4028/www.scientific.net/MSF.519-521.641

Citation:

A. J. Davenport et al., "Intergranular Corrosion and Stress Corrosion Cracking of Sensitised AA5182", Materials Science Forum, Vols. 519-521, pp. 641-646, 2006

Online since:

July 2006

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Price:

$35.00

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