Correlations between intergranular stress corrosion cracking, grain-boundary microchemistry, and grain-boundary electrochemistry for Al-Zn-Mg-Cu alloys

By S. Knight, Nick Birbilis, B. C. Muddle, A. Trueman, S. Lynch. 2010

290 citations recorded by the source corpus.

Abstract There is little or no correlation between grain-boundary, or matrix, microstructures and stress corrosion cracking (SCC) susceptibility. Grain-boundary microchemistry, especially the copper content of grain-boundary precipitates (GBP) is the most important factor. Further evidence for this is a correlation between the initial open-circuit potential of ‘fresh’ brittle intergranular fracture surfaces, the copper content of GBP, and the plateau SCC velocities of overaged 7079 and 7075 alloys. Preliminary comparisons of overaged (T7) and peak-aged (T651) material have also been made, and support the view that beneficial effects of overaging on SCC resistance is associated with increasing copper content of GBPs.

Subfields: Aerospace Engineering, Materials Chemistry, Metals and Alloys

View Paper: https://www.semanticscholar.org/paper/be13c5309f0a15c32ad60e6442b26b6061279e69

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aerospace Engineering

1. Dierk Raabe
2. P. Rometsch
3. Zhiming Li

In Materials Chemistry

1. Dierk Raabe
2. D. Ponge
3. Baptiste Gault
4. O. A. Zambrano
5. Franz Roters
6. C. Tasan
7. Philip Eisenlohr
8. T. Bieler

In Metals and Alloys

1. Dierk Raabe
2. D. Ponge
3. Baptiste Gault
4. C. Tasan
5. Zhiming Li

Citations in the corpus

• Segregation assisted grain boundary precipitation in a model Al-Zn-Mg-Cu alloy (2018, background): “role for several reasons: First, they are well known to become highly susceptible to stress corrosion cracking and subject to brittle intergranular fracture under certain conditions of heat treatment [21, 22, 23, 24]. The embrittlement has been attributed to the formation of the coarse, incoherent p”
• Heat treatment of 7xxx series aluminium alloys—Some recent developments (2014, background): “For over-aged alloys, there was an approximately linear relationship between the plateau velocities (on a log scale spanning 4 orders of magnitude) and the potential at the start of corrosion (when the potential was influenced by the large area fraction of up to 30% of grain boundary precipitates) [”