3D time-resolved observations of corrosion and corrosion-fatigue crack initiation and growth in peak-aged Al 7075 using synchrotron X-ray tomography

Journal Article · Sun Jul 01 00:00:00 EDT 2018 · Corrosion Science

DOI:https://doi.org/10.1016/j.corsci.2018.04.029· OSTI ID:1474321

Stannard, Tyler J.; Williams, Jason J.; Singh, Sudhanshu S.; Sundaram Singaravelu, Arun Sundar; Xiao, Xianghui; Chawla, Nikhilesh

Corrosion fatigue crack initiation and growth from corrosion pits in 7075 aluminium alloys was observed in situ using 3D x-ray synchrotron tomography. Peak-aged Al 7075 was corroded by soaking in 3.5 wt.% NaCl solution, then fatigue tested in situ in the solution using synchrotron X-ray tomography to analyse the corrosion fatigue crack initiation and growth from the pits. Hydrogen bubbles were observed within the intergranular corrosion fatigue cracks, indicating chemical changes in the sample during corrosion fatigue. In situ crack growth, the effect of microstructural constituents on dissolution and growth, and multimodal observations of the fracture surface were conducted and are discussed.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1474321
• Journal Information: Corrosion Science, Vol. 138, Issue C; ISSN 0010-938X
• Publisher: Elsevier
• Country of Publication: United States
• Language: English