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.
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