The steady state plane strain fatigue crack growth in a 2024-type Al alloy was investigated using in situ high resolution synchrotron radiation x-ray microtomography. A novel microstructural crack displacement gauging method was used to quantify the mixed mode character of crack opening displacement and the closure effect. A liquid gallium grain boundary wetting technique was used in conjunction with the microtomography to visualize the correlation between the fatigue crack behaviour and the three-dimensional (3D) structure of the grains. Electron backscattering diffraction assessment of the grain orientation on the samples was found to provide a uniquely complete 3D description of crack-microstructure interactions.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials