Journal
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 97, Issue -, Pages 275-284Publisher
ELSEVIER
DOI: 10.1016/j.msec.2018.11.077
Keywords
Selective Laser Melting; TNTZ; Biocompatibility; Mechanical properties; Microstructure
Categories
Funding
- Shenzhen Science and Technology Innovation Commission [ZDSYS201703031748354, JCYJ20170817110331228]
- National Natural Science Foundation of China [51604104]
- Natural Science Foundation of Guangdong Province [2016A030313756]
- Pico Center at SUSTech
- Development and Reform Commission of Shenzhen Municipality
- Humboldt Research Fellowship for Experienced Researchers
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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 mu m, laser exposure time between 135 and 200 us, 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.
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