AccScience Publishing / IJB / Volume 7 / Issue 2 / DOI: 10.18063/ijb.v7i2.340
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REVIEW

A Review on Design and Mechanical Properties of Additively Manufactured NiTi Implants for Orthopedic Applications

Yintao Zhang1 ,  Shokouh Attarilar1,2 ,  Liqiang Wang1* ,  Weijie Lu1* ,  Junlin Yang2* ,  Yuanfei Fu3*
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1 State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2 Department of Pediatric Orthopaedics, Xinhua Hospital Affiliated to Shanghai Jiao Tong University, School of Medicine, Shanghai 200092, China
3 Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
IJB 2021, 7(2), 340 https://doi.org/10.18063/ijb.v7i2.340
© Invalid date by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

NiTi alloy has a wide range of applications as a biomaterial due to its high ductility, low corrosion rate, and favorable biocompatibility. Although Young’s modulus of NiTi is relatively low, it still needs to be reduced; one of the promising ways is by introducing porous structure. Traditional manufacturing processes, such as casting, can hardly produce complex porous structures. Additive manufacturing (AM) is one of the most advanced manufacturing technologies that can solve impurity issues, and selective laser melting (SLM) is one of the well-known methods. This paper reviews the developments of AM-NiTi with a particular focus on SLM-NiTi utilization in biomedical applications. Correspondingly, this paper aims to describe the three key factors, including powder preparation, processing parameters, and gas atmosphere during the overall process of porous NiTi. The porous structure design is of vital importance, so the unit cell and pore parameters are discussed. The mechanical properties of SLM-NiTi, such as hardness, compressive strength, tensile strength, fatigue behavior, and damping properties and their relationship with design parameters are summarized. In the end, it points out the current challenges. Considering the increasing application of NiTi implants, this review paper may open new frontiers for advanced and modern designs.

Keywords
NiTi
Additive manufacturing
Orthopedic implants
Porous structure
Mechanical properties
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International Journal of Bioprinting, Electronic ISSN: 2424-8002 Print ISSN: 2424-7723, Published by AccScience Publishing
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