|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
|Interaction of Glide Dislocations with Interfaces in Mg Alloys
|M. T. Andani, Z. Huang, C. Yang, A. Lakshmanan, L. Qi, V. Sundararaghavan, J. E. Allison, Amit Misra
|On-Site Speaker (Planned)
An overview of the interaction of basal <a> dislocations with interfaces in Mg alloys will be presented. In the case of dilute, aged Mg-Nd alloys, in situ indentation in TEM shows that matrix dislocations pile-up at beta-1 precipitate interfaces in the confined regions. Dislocation theory and density functional theory calculations indicate that planar precipitate “walls” result in a strong but not impenetrable barrier to slip transmission. In dilute Mg-Al single phase alloys, high-resolution electron backscatter diffraction is used to measure barrier strength of specific GBs to specific slip systems. The results are analyzed using dislocation pile-up model and used to calibrate grain size strengthening parameters in a crystal plasticity model. Integration of local experimental measurements of dislocation-interface interactions with computational modeling at corresponding length scales is shown to be effective in developing predictive models of alloy strength.
|Magnesium, Characterization, Mechanical Properties