About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing of Functional and Energy Materials
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Presentation Title |
Effect of Post-process Heat Treatment on Microstructure and Properties of a Ni-Mn-Ga Alloy Deposited Using Laser Powder Bed Fusion |
Author(s) |
Ville Laitinen, Alexei Sozinov, Andrey Saren, Antti Salminen, Kari Ullakko |
On-Site Speaker (Planned) |
Ville Laitinen |
Abstract Scope |
In this study, a Ni-Mn-Ga based magnetic shape memory (MSM) alloy was deposited using laser powder bed fusion (L-PBF), and a systematic design of experiments approach was used for investigating the effects of post-process chemical homogenization and structural ordering heat treatment on microstructure and properties of the deposited material. The experiments were implemented using temperature and duration of the heat treatment as varied parameters. The phase transformation and Curie temperatures of each sample were determined using low-field ac magnetic susceptibility method and differential scanning calorimetry, whereas the microstructures of the samples were characterized using SEM, X-ray diffraction and atomic/magnetic force microscopy. The results show that grain growth, recrystallization, and transition of the crystal structure from the mixed martensite structure of the as-deposited material to single martensite phase occurred during the heat treatment. Consequently, the deposited material showed recovery of the typical narrow phase transformations and ferromagnetic properties. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |