Comparing the mechanical properties, microstructure, texture and in-vitro degradation behavior of TNTZ/nano-fluorapatite composite and TNTZ bioalloy. (May 2021)

• Record Type: Journal Article
• Authors: Rajabi, F.; Zarei-Hanzaki, A.; Abedi, H.R.; Safdel, A.; Bertrand, E.
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 117(2021)
• Publication Date: 2021-05
• Subjects: Titanium alloy -- Friction stir processing -- Microstructure -- Nanocomposite -- Biocompatibility -- Corrosion resistance; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2021.104402
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: The present study deals with (i) the fabrication of the composite surface layer of Ti–29Nb–13Ta-4.6Zr/nano-fluorapatite through friction stir processing, (ii) clarifying the correlation of microstructure and texture with in-vitro degradation behavior and bioactivity of fabricated nano-biocomposite, and (iii) comparing the mechanical and functional properties of nano composite whit those obtained for TNTZ bio-alloy. The results indicated that increasing the number of deformation passes effectively refines the microstructure, leading to the average grain sizes of less than 5 μm. The texture of the material was also evolved in the presence of the nano particles where the grains reorient along <111> direction in contrast to the <101>-oriented grains in the starting microstructure. In-vitro bioactivity of the processed samples was measured after being immersed in simulated body fluid solution for various duration up to 30 days. Enhanced corrosion resistance and bio-mineralization of nanocomposite surface layer was discussed relying on the occurrence of grain refinement, substructure development and evolution of texture components along <101> direction. Assessment of the mechanical properties of the fabricated composites and as-received material also indicated the positive effect of the applied processing route and the presence of nano particles. Graphical abstract: Image 1 Highlights: Fabricating and processing of TNTZ nano-bio composite through friction stir processing. The formed surface nano-apatite layer acted as barriers against metallic ion releasing. Influence of the grain size and substructure on in-vitro degradation behavior. Direct correlation of texture evolution with invitro degradation and bioactivity. Dispersion of nFA particles change the grains orientation from <101> toward <111>.