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Low-modulus biomedical Ti-30Nb-5Ta-3Zr additively manufactured by Selective Laser Melting and its biocompatibility

J P Luo¹, J F Sun², Y J Huang²

¹School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; Department of Materials Science and Engineering, Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials, Southern University of Science and Technology of China, Shenzhen 518055, China.

Materials Science & Engineering. C, Materials for Biological Applications

|January 26, 2019

Abstract:

Low Young's modulus titanium alloys, such as Ti-30Nb-5Ta-3Zr (TNTZ) of this study, were promising biocompatible implant materials. In this work, TNTZ samples with relative density of 96.8%-99.2% were additively manufactured by powder-bed based Selective Laser Melting (SLM) through tuning processing parameters, i.e. varying the point distance between 50 and 75 μm, laser exposure time between 135 and 200 μs, and a fixed laser power of 200 W. The microstructure, elastic properties, fatigue properties and machining accuracy of the fabricated samples have been investigated. Lattice structure TNTZ samples with porosity of 77.23% were also fabricated to further reduce the Young's modulus of the TNTZ. According to the Relative Growth Rate (RGR) value, the as-printed TNTZ samples exhibited no cell cytotoxicity, where they showed even better biocompatibility than the comparative, as-printed Ti-6Al-4V samples. The as-printed TNTZ developed by the study demonstrates good biocompatibility, low stress shielding tendency and high mechanical properties.

Keywords:

Biocompatibility Mechanical properties Microstructure Selective Laser Melting TNTZ

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