Fundamental Processes Responsible for Continuous Dynamic Recrystallization: An In-Situ Tem Study
Material from interrupted superplastic deformation tests of an Al-4Mg-0.3Sc alloy have been restrained in situ in the transmission electron microscope at nominally the superplastic forming temperature. In material pre-deformed to 0.2 true strain the migration of subgrain boundaries, their interaction and trapping at Al3Sc particles, and their disintegration were observed dynamically. The dislocations released during the disintegration of the subgrain boundaries moved rapidly through the matrix and were incorporated into the bounding grain boundaries. The resulting increase in grain boundary energy caused rupture and annihilation of a grain boundary triple point. This process was accompanied by a large volume rotation, resulting in a common orientation. The interaction of subgrain boundaries with Al3Sc particles, and the bypass mechanism have also been observed. These observations will be discussed in relation to the macroscopic response of the material.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 15007061
- Report Number(s):
- PNNL-SA-37709; KC0201020; TRN: US0401389
- Resource Relation:
- Conference: Hot Deformation of Aluminum Alloys III, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 10 May 2003
- Country of Publication:
- United States
- Language:
- English
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