ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
AA5182 (Al-4.5 wt% Mg) can become susceptible to intergranular corrosion (IGC) withtime at moderately elevated service temperatures owing to precipitation of Mg-rich β-phase at grainboundaries, which can lead to stress corrosion cracking (SCC). The IGC and SCC susceptibility ofAA5182 was found to depend strongly on sensitisation heat treatments. AFM and TEM studiesdemonstrated that the degree of precipitation and thus susceptibility to attack for a boundary can berelated to its crystallographic misorientation. Low angle boundaries (〈20°) are most resistant toattack as they do not show β-phase precipitation. However, higher angle boundaries show highlyvariable precipitation and corrosion susceptibility: critical factors are the grain boundary plane andprecipitate/matrix crystallographic relationship
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.641.pdf
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