About this Abstract |
Meeting |
12th International Conference on Magnesium Alloys and their Applications (Mg2021)
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Symposium
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12th International Conference on Magnesium Alloys and their Applications (Mg 2021)
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Presentation Title |
The Role of Dislocation Climb in the High Temperature Deformation of Mg alloys AZ31B and ZK10 and the Distinctions in the Activity of Dislocations with a c-type Burgers Vector |
Author(s) |
Michael Ritzo, Sean R. Agnew |
On-Site Speaker (Planned) |
Michael Ritzo |
Abstract Scope |
Tensile samples of a Mg alloys AZ31B and ZK10 sheet were tested at a range of temperatures and strain rates designed to rather evenly probe a similar range of Zener-Hollomon (Z) parameter values. A version of the viscoplastic self-consistent (VPSC) code, which accounts for the kinematics of dislocation climb, is used to model the behavior. Both alloys exhibit a transition in the r-values and texture evolution at some value of Z. Below this critical value the constitutive response transitions to a power law and the modeling reveals that dislocation climb plays a significant role in strain accommodation. While the behavior of AZ31B does not demand activity of dislocations with a c-type Burgers vector, the ZK10 alloy does. TEM-based investigation of dislocations in samples deformed above and below the aforementioned transition is employed to provide an explanation for the distinct behavior of the two alloys. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |