|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Effect of 3D Crystallographic Orientation and Microstructure on the Evolution of Corrosion in Aluminum Alloys
||Tyler Stannard, Hrishikesh Bale, Nicolas Gueninchault, Jeff Gelb, Arno Merkle, Erik Lauridsen, Nikhilesh Chawla
|On-Site Speaker (Planned)
Aluminum alloys are frequently exposed to harsh environments in service. Several factors including the underlying microstructure, defects, and crystallographic orientations effect corrosion-related fracture of these alloys. Grain mapping techniques like EBSD are restricted to 2D surface imaging and can only be extended in three dimensions by serial sectioning of the sample. Laboratory-based diffraction contrast tomography is now possible on a commercially available X-ray microscope enabling a time dependent study of corrosion in aluminium alloys wherein samples can be imaged in 3D to understand the complex mechanisms of corrosion. We present results of LabDCT applied to peak-aged 7475 alloy which reveal the 3D microstructure. Absorption tomography data clearly shows the distribution of inclusions throughout the sample volume along with LabDCT results showing corresponding grain information. We also present the results of combining the two datasets, which enables quantification of the influences of grain orientation and inclusions on corrosion pit formation.
||Planned: Supplemental Proceedings volume