| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
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TMS-DGM Symposium: A Joint US-European Symposium on Linking Basic Science to Advances in Manufacturing of Lightweight Metals
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| Presentation Title |
Stacking-fault Mediated Plasticity and Strengthening in Lean, Rare-earth Free Magnesium Alloys |
| Author(s) |
Indranil Basu, Jörg F Löffler |
| On-Site Speaker (Planned) |
Indranil Basu |
| Abstract Scope |
A magnesium alloy with lean additions of Zn (1wt.%) and Ca (0.3wt.%), ZX10, and pure Mg were subjected to orientation-dependent micropillar indentation tests at room-temperature. Two different orientations of single-crystalline micropillars were fabricated to activate c-axis extension and c-axis compression. For both loading conditions, ZX10 reveals a strengthening increment by a factor of 2 to 2.5 compared to pure Mg, plus simultaneous plasticity enhancement. Under c-axis extension, correlative transmission EBSD and TEM reveals that deformation in ZX10 proceeds via twinning plus activation of homogeneous basal and non-basal slip at higher strains, whereas pure Mg reveals deformation through tension twinning and basal slip. In c-axis compression, ZX10 shows dual activation of basal <a> and pyramidal <c+a> dislocations, while pure Mg deforms by basal dislocation-mediated massive sliding. We illustrate how minute additions of Zn and Ca solutes modify intrinsic stacking-fault energies and thus are able to generate significant strength and ductility enhancement. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Characterization, Mechanical Properties |