|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Functional, Energy, and Magnetic Materials
||Establishing Fundamentals for Laser Metal Deposition of Functional Ni-Mn-Ga Alloys: Effect of Rapid Solidification on Microstructure and Phase Transformation Characteristics
||Emily Flitcraft, Jakub Toman, Markus Chmielus, Carolin Fink
|On-Site Speaker (Planned)
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 (102-104 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.