Healing behavior of preexisting hydrogen micropores in aluminum alloys during plastic deformation
Abstract
Synchrotron X-ray microtomography was used to observe the shrinkage and annihilation behaviors of hydrogen micropores in three dimensions during hot and cold plastic deformation of an Al-Mg alloy. Whether complete healing of micropores is achieved after plastic deformation was examined by exposing the material to a high temperature after plastic deformation. Although micropores generally show a pattern of shrinking and closing, closer inspection of a single specimen revealed a variety of geometrically variable behaviors. It is noteworthy that some of the micropores are reinitiated in positions identical to those before their annihilation, even after an 8-22% macroscopic strain has been further applied after annihilation. We attribute local variations such as these to significant local strain variation, which we measured in a series of tomographic volumes by tracking the microstructural features.
- Publication:
-
Acta Materialia
- Pub Date:
- 2009
- DOI:
- 10.1016/j.actamat.2009.06.012
- Bibcode:
- 2009AcMat..57.4391T
- Keywords:
-
- Aluminum alloys;
- Microtomography;
- Hydrogen;
- Micropore;
- Healing