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Meeting Materials Science & Technology 2020
Symposium Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
Presentation Title Establishing Fundamentals for Laser Metal Deposition of Functional Ni-Mn-Ga Alloys: Effect of Rapid Solidification on Microstructure and Phase Transformation Characteristics
Author(s) Emily Ann Flitcraft, Carolin Fink, Markus Chmielus, Jakub Toman
On-Site Speaker (Planned) Emily Ann Flitcraft
Abstract Scope Laser-based additive manufacturing holds the promise of enabling complex geometries for shape memory alloy components. However, rapid melting, resolidification and multiple reheating create challenging microstructures characteristic of non- or low-functional alloys. We investigate how non-equilibrium processing and complex thermal cycling effect microstructural evolution and functional properties in Ni-Mn-Ga magnetic shape memory alloys. This talk gives insight into our efforts to establish cooling rate-microstructure-magnetic property relations that will help identify processing conditions for laser metal deposition (LMD) of functional Ni-Mn-Ga alloy. Physical simulation of rapid solidification achieved cooling rates that resemble what is seen in LMD (100-10000 K/s). Microstructure characterization was performed as a function of cooling rate using scanning electron microscopy, electron dispersive spectroscopy, and X-ray diffraction. The effect of cooling rate on phase transformation characteristics was investigated using differential scanning calorimetry. If available at time of presentation, results from magnetic property measurements using vibrating-sample magnetometer will also be included.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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