| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
Linking Plastic Deformation and Magnetic Properties in Mn-based Heusler Intermetallics |
| Author(s) |
Bailey E. Rhodes, Justin A. Mayer, Xiaoke Xu, W. Streit Cunningham, Coleman Forth, Christian Kübel, Ram Seshadri, Yolita M. Eggeler, Daniel S. Gianola |
| On-Site Speaker (Planned) |
Bailey E. Rhodes |
| Abstract Scope |
Defect engineering represents an emerging strategy to manipulate bulk properties in magnetic intermetallic materials. In this investigation, magnetization measurements collected before and after plastically deforming Mn-based Heusler alloys reveal a 90% reduction in saturation magnetization after deformation. Synchrotron X-ray diffraction and line profile analyses, in concert with STEM imaging, are used to quantify defect densities and characterize dislocation sub-structures resulting from plastic deformation. Density Functional Theory gamma-surfaces are used to predict distinct magnetic orderings based on slip pathways from dissociated dislocations in MnCu2Al. Differential Contrast Imaging Scanning Transmission Electron Microscopy performed for the deformed material reveals pinning of ferromagnetic domains at non-magnetic strips hosted at nano-scale planar defects. Based on these collective results, we propose a mesoscale magnetic model, facilitated by the local antiferromagnetic character at planar faults that are abundant within dislocation cell walls, to rationalize the differences between experimental magnetization behavior before and after plastic deformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Mechanical Properties, Modeling and Simulation |