| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
|
| Presentation Title |
Microstructure and Property Differences in Sintered and Annealed Binder-Jet 3D Printed Ni-Mn-Ga Magnetic Shape Memory Alloys |
| Author(s) |
Aaron Acierno, Ville Laitinen, Jakub Toman, Katerina Kimes, Mirko Boin, Robert Wimpory, Andrey Saren, Kari Ullakko, Markus Chmielus |
| On-Site Speaker (Planned) |
Aaron Acierno |
| Abstract Scope |
Ni-Mn-Ga Heusler alloys are multifunctional metals that demonstrate macroscopic deformation under an externally applied magnetic field by the motion of martensitic twin boundaries. Neutron diffraction analysis identified the martensite modulation and observed the grain size evolution in binder-jet 3D printed Ni-Mn-Ga samples sintered at 1080 °C and 1090 °C. Large clusters of high neutron-count pixels in samples sintered at 1090 °C were identified,suggesting Bragg diffraction of large grains compared to 1080 °C sintered samples, which was confirmed by quantitative stereology. Greater resistance to plasticity was noted in 1090 °C sintered samples through nanoindentation as a result of the increased densification. An upward shift of a few degrees in major structural and magnetic transformation temperatures was seen in 1090 °C sintered samples. Additionally, twin variants on the order of ≤10 μm in width were observed and the origin of magnetic anisotropy verified through magnetic force microscopy (MFM). |