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Microstructure and Phase Transformation of Biomedical Ti–20Nb–12Ta–0.5Zr Alloys Fabricated by Selective Laser Melting

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This research was focused on the microstructure and phase transformation of Ti–20Nb–12Ta–0.5Zr alloys fabricated by selective laser melting (SLM) for bone implantation application. It was found that transformation temperatures, phase transformation behavior, strength, and microstructure were highly post heat-treatment dependent. Experimental results showed that the Ti–20Nb–12Ta–0.5Zr alloys can maximize the tensile stress and reduce the Young's modulus in proper post heat-treatment. The XRD spectra revealed that the microstructures of the Ti–20Nb–12Ta–0.5Zr alloys in this post heat-treatment changed from β phase and athermal ω phase and finally into stable β phase as water quenching eliminated ω phase. The alloy with stable β phase exhibited lower modulus than that of conventional Ti-based alloys. Finally, the vivo evaluation showed that the Ti–20Nb–12Ta–0.5Zr alloys could enhance bone formation and reduce osseointegration which is suitable for bone implants from the view of both mechanical properties and biocompatibility.
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Keywords: BIOCOMPATIBILITY; MICROSTRUCTURE; PHASE TRANSFORMATION; SELECTIVE LASER MELTING; TITANIUM ALLOYS

Document Type: Short Communication

Publication date: March 1, 2017

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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