Paper Title:
Intergranular Corrosion and Stress Corrosion Cracking of Sensitised AA5182
  Abstract

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, Y. Yuan, R. Ambat, B. J. Connolly, M. Strangwood, A. Afseth, G. M. Scamans, "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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$32.00
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