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Materials 2018, 11(4), 519; https://doi.org/10.3390/ma11040519

A Review of Selective Laser Melted NiTi Shape Memory Alloy

1
Institute for Sports Research, School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
2
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
3
Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
4
Department of Bioinformatics and Medical Engineering, Asia University, Taichung 41354, Taiwan
5
3D Printing Medical Research Institute, Asia University, Taichung 41354, Taiwan
*
Author to whom correspondence should be addressed.
Received: 28 February 2018 / Revised: 24 March 2018 / Accepted: 26 March 2018 / Published: 29 March 2018
(This article belongs to the Special Issue NextGen Materials for 3D Printing)
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Abstract

NiTi shape memory alloys (SMAs) have the best combination of properties among the different SMAs. However, the limitations of conventional manufacturing processes and the poor manufacturability of NiTi have critically limited its full potential applicability. Thus, additive manufacturing, commonly known as 3D printing, has the potential to be a solution in fabricating complex NiTi smart structures. Recently, a number of studies on Selective Laser Melting (SLM) of NiTi were conducted to explore the various aspects of SLM-produced NiTi. Compared to producing conventional metals through the SLM process, the fabrication of NiTi SMA is much more challenging. Not only do the produced parts require a high density that leads to good mechanical properties, strict composition control is needed as well for the SLM NiTi to possess suitable phase transformation characteristics. Additionally, obtaining a good shape memory effect from the SLM NiTi samples is another challenging task that requires further understanding. This paper presents the results of the effects of energy density and SLM process parameters on the properties of SLM NiTi. Its shape memory properties and potential applications were then reviewed and discussed. View Full-Text
Keywords: 3D printing; 4D printing; additive manufacturing; Selective Laser Melting; NiTi; shape memory alloy 3D printing; 4D printing; additive manufacturing; Selective Laser Melting; NiTi; shape memory alloy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Khoo, Z.X.; Liu, Y.; An, J.; Chua, C.K.; Shen, Y.F.; Kuo, C.N. A Review of Selective Laser Melted NiTi Shape Memory Alloy. Materials 2018, 11, 519.

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