About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
In-situ X-ray Microtomography to Elucidate Corrosion-fatigue Mechanisms in Aluminum Alloys |
Author(s) |
Arun S Sundar, Jason Williams, Harsh Goyal, Sridhar Niverty, Sudhanshu Singh, Tyler Stannard, Xianghui Xiao, Nikhilesh Chawla |
On-Site Speaker (Planned) |
Nikhilesh Chawla |
Abstract Scope |
Aluminum alloys are frequently exposed to harsh environments in service. X-ray synchrotron micro and nanotomography provides a wonderful means of characterization damage in materials non-destructively. In this talk, I will describe experiments and simulations that address the critical link between microstructure and corrosion-fatigue behavior of aluminum alloys, by using three-dimensional (3D) x-ray synchrotron tomography. To investigate the effects of corrosion and fatigue on peak-aged 7075 aluminum alloy, corroded samples were tested via in situ x-Ray tomography to analyze the fatigue crack initiation and growth characteristics. Hydrogen bubbles were observed between the sample and the fluid upon crack initiation, indicating chemical changes in the sample during in situ corrosion fatigue. The effect of oxide layers forming during corrosion and 2nd phase inclusions, on fatigue initiation and propagation, will be discussed. New opportunities for x-ray microtomography, including lab-scale diffraction contrast tomography and the next generation of x-ray synchrotron tomography will be highlighted. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |