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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).


3D Printed Shape Memory Polymers: Electronics and Morphing
Characterization of n-type Bismuth Telluride Processed via Selective Laser Melting
Compressive Behavior of NiMnGa Parts Fabricated by Binder Jet Additive Manufacturing
Defect Recognition on Coating Layer Using PinPoint Nanomechanical Mode in Atomic Force Microscopy
Epitaxial growth of a magnetic shape-memory alloy via laser melting and directed energy deposition
Establishing Fundamentals for Laser Metal Deposition of Functional Ni-Mn-Ga Alloys: Effect of Rapid Solidification on Microstructure and Phase Transformation Characteristics
Microstructure and Property Differences in Sintered and Annealed Binder-Jet 3D Printed Ni-Mn-Ga Magnetic Shape Memory Alloys
Strand Casting and Thermal Properties of Submillimeter Metallic Glass Wires

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