| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder Processing of Functional and Magnetic Materials
|
| Presentation Title |
Selective Laser Melting of NiTi: Experiments and Modeling to Correlate Hatch Spacing, Texture, Residual Stress, and Superelastic Response |
| Author(s) |
Peter Martin Anderson, Natalie Zeleznik, Alejandro Hinojos, Mohammadreza Nematollahi, Narges Shayesteh, Soheil Saedi, Mohammad Elahinia, Haluk Karaca, James Cawley, Michael Mills |
| On-Site Speaker (Planned) |
Peter Martin Anderson |
| Abstract Scope |
Recent work has demonstrated that Ni50.8Ti49.2 (at%) samples fabricated by selective laser melting (SLM) can provide up to 5.6% superelastic compressive strain without any post heat treatment. Of particular interest is the ability to manipulate texture and superelastic response by varying the hatch spacing used in the SLM process. Samples with 80 micron hatch spacing display relatively stable superelastic stress-strain response under repeated mechanical cycling while those with 180 micron hatch spacing exhibit ratcheting and evolution to a more linearized response during cycling. The underlying physics for the different responses are explored using mechanics modeling that captures the effects of texture and residual stress on cyclic stress-strain response. The results indicate that a variety of superelastic responses may be attained through the manipulation of hatch spacing during SLM processing. This offers a wide functional space within which to design SMA devices. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Mechanical Properties |