Thermomechanical characterization of Ni-rich NiTi fabricated by selective laser melting

This study presents the shape memory behavior of as-fabricated and solution annealed Ni50.8Ti49.2 alloys fabricated using the selective laser melting (SLM) technique. Results were compared to the initial ingot that was used to fabricate powders. Optical microscopy was employed to reveal the microstr...

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Bibliographic Details
Published in:Smart materials and structures 2016-03, Vol.25 (3), p.35005-35012
Main Authors: Saedi, Soheil, Turabi, Ali Sadi, Andani, Mohsen Taheri, Haberland, Christoph, Elahinia, Mohammad, Karaca, Haluk
Format: Article
Language:English
Subjects:
additive manufacturing
Alloys
Compressive properties
Ingots
Intermetallic compounds
Intermetallics
Laser beam melting
Microstructure
selective laser melting
Shape memory alloys
Superelasticity
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Summary:This study presents the shape memory behavior of as-fabricated and solution annealed Ni50.8Ti49.2 alloys fabricated using the selective laser melting (SLM) technique. Results were compared to the initial ingot that was used to fabricate powders. Optical microscopy was employed to reveal the microstructure. The shape memory effect under constant compressive stress and isothermal compressive stress cycling tests were utilized to investigate the shape memory characteristics of the initial ingot and fabricated alloys. It was revealed that the SLM method and post heat treatments can be used to tailor the microstructure and shape memory response. Partial superelasticity was observed after the SLM process. Solutionizing the fabricated samples increased the strength and improved the superelasticity but slightly decreased the recoverable strain.
ISSN:0964-1726
1361-665X
DOI:10.1088/0964-1726/25/3/035005