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

Yintao Zhang, Shokouh Attarilar, Liqiang Wang, Weijie Lu, Junlin Yang, Yuanfei Fu

Article ID: 340
Vol 7, Issue 2, 2021, Article identifier:340

VIEWS - 1340 (Abstract) 171 (PDF)

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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 AMNiTi 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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References


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DOI: http://dx.doi.org/10.18063/ijb.v7i2.340

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