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Intergranular stress corrosion crack propagation in rolled AZ31 Mg alloy

: Casajús, P.; Winzer, N.

Fulltext urn:nbn:de:0011-n-2873012 (2.3 MByte PDF)
MD5 Fingerprint: 059cb78084c713489dd177d50292f6bb
Created on: 5.5.2016

Materials Science and Engineering, A. Structural materials, properties, microstructure and processing 602 (2014), pp.58-67
ISSN: 0921-5093
ISSN: 1873-4936
Journal Article, Electronic Publication
Fraunhofer IWM ()
EBSD; magnesium alloys; sheet forming; hydrogen embrittlement

The susceptibility to stress corrosion cracking (SCC) of hot-rolled AZ31 Mg alloy sheets with different levels of deformation were evaluated by constant extension rate tensile (CERT) testing in distilled water. The normalised macroscopic SCC susceptibilities of the materials, characterised in terms of the normalised UTS and elongation-to-failure, were relatively consistent; however, the predominant mode of SCC propagation was strongly dependent on the microstructure. For all materials, cracks were initiated by localised film rupture and dissolution. Crack propagation through fine-grained, recrystallised regions was intergranular, whereas crack propagation through the larger, original grains was transgranular and tended to follow View the MathML source{101¯2} twin boundaries. In both cases, the crack propagation mechanism was a form of hydrogen embrittlement.