| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2025
|
| Presentation Title |
Considering the possibility of significant strain accomodation via dislocation climb using dislocation density measurements |
| Author(s) |
Michael Ritzo, Jishnu Bhattacharyya, Kristian Mathis, Sean R. Agnew |
| On-Site Speaker (Planned) |
Sean R. Agnew |
| Abstract Scope |
Dislocation density-based constitutive models require accurate, statistically significant knowledge of the evoltion of dislocation density. Additionally, recent crystal plasticity modeling has suggested that dislocation climb may be an important contributor to strain accomodation. Here, ex-situ X-ray line profile analysis (XLPA) and electron backscattered diffraction (EBSD) are employed to examine the <a>, <c> and <c+a> densities within Mg alloys AZ31B and ZK10 tested in uniaxial tension at various temperatures. EBSD reveals geometrically necessary dislocation (GND) accumulation near grain boundaries during low temperature plasticity, whereas GNDS are primarily associated with grain subdivision after dislocation climb and glide, power law creep-type deformation. XLPA reveals that the relative density of <a> dislocations drops with increasing temperature more rapidly than <c> and <c+a> in AZ31B, whereas the relative densities remain relatively constant in ZK10. Both solute content and initial texture appear to play important roles in determining the degree to which climb accomodates strain. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Magnesium, Shaping and Forming |