3D Time-Resolved Observations of Fatigue Crack Initiation and Growth from Corrosion Pits in Al 7XXX Alloys Using In Situ Synchrotron X-ray Tomography

Abstract

In situ three-dimensional X-ray synchrotron tomography was used to visualize and quantify the fatigue crack initiation and growth from corrosion pits in high strength aluminum alloys. Corrosion pitted Al 7075 and Al 7475 samples of peak-aged, over-aged, and highly over-aged conditions were prepared by soaking in 3.5 wt pct NaCl solution for fifteen days. These samples were fatigue tested in situ in 3.5 wt pct NaCl solution using synchrotron X-ray tomography to analyze the fatigue crack initiation and growth characteristics (4D). Increases in maximum pit depth and fatigue crack growth rate variability were found with increased aging. A detailed analysis of crack morphology and deflection, as a function of aging, was carried out and it discussed.

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Acknowledgments

The authors are grateful for financial support from the Office of Naval Research (ONR) under Contract No. N00014-10-1-0350 (Drs. A. K. Vasudevan and W. Mullins, Program Managers). TJS acknowledges support from the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE 1311230. We gratefully acknowledge the use of facilities within the LeRoy Eyring Center for Solid State Science and the Center for 4D Materials Science at Arizona State University. We also gratefully acknowledge the use of resources at Beamline 2-BM of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

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Manuscript submitted May 13, 2019.

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Singaravelu, A.S.S., Williams, J.J., Goyal, H.D. et al. 3D Time-Resolved Observations of Fatigue Crack Initiation and Growth from Corrosion Pits in Al 7XXX Alloys Using In Situ Synchrotron X-ray Tomography. Metall Mater Trans A 51, 28–41 (2020). https://doi.org/10.1007/s11661-019-05519-z

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