| About this Abstract |
| 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. |