What is it about?
The publication focuses on the effect of short transverse loading (highly susceptible to intergranular stress corrosion cracking) versus long transverse (much less susceptible) in Al-Mg alloys. Most interestingly, this work shows a delamination mechanism that these alloys exhibit when loaded in the less susceptible orientation, since intergranular fracture in the perpendicular direction is so much more preferred! Analysis in saline aqueous immersion and laboratory air environments shows that this delamination only occurs in immersion, which contrasts findings currently in the literature on this mechanism occurring under fatigue conditions in laboratory air.
Featured Image
Why is it important?
These results further the understanding of intergranular stress corrosion cracking (IG-SCC) behavior in Al-Mg alloys, and inform as to which alloy orientations may deliver the least IG-SCC susceptibility to promote longer service life. The use of a hydrogen-based failure model to explain this delamination mechanism is also novel, and further establishes the validity of this hydrogen enhanced decohesion theory in Al-Mg alloys.
Perspectives
This work's focus on the true nature of IG-SCC when subjected to different testing methods is truly interesting, especially upon successful coupling with the hydrogen enhanced decohesion model to explain why such delamination is preferable in Al-Mg alloys. This publication was also chosen as the Featured Open Access article in Corrosion Journal's June 2017 edition, so anyone will be able to read about this work!!
Matthew E. McMahon
University of Virginia
Read the Original
This page is a summary of: The Effect of Loading Orientation on the Stress Corrosion Cracking of Al-Mg Alloys, CORROSION, January 2017, NACE International,
DOI: 10.5006/2343.
You can read the full text:
Contributors
The following have contributed to this page
