Novel bioactive Ti-Zn alloys with high strength and low modulus for biomedical applications

• Published in: Journal of alloys and compounds Vol. 931; p. 167555
• Main Authors: Qi, M.H., Xu, J.L., Lai, T., Huang, J., Ma, Y.C., Luo, J.M., Zheng, Y.F.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 10-01-2023; Elsevier BV
• Subjects: Binary alloys; Biocompatibility; Biological activity; Biological properties; Biomedical application; Biomedical materials; Compressive strength; Contact angle; Corrosion resistance; Cytocompatibility; High strength alloys; Hot-press sintering; Mechanical properties; Modulus of elasticity; Nanohardness; Precipitation hardening; Ti-Zn alloy; Titanium alloys; Titanium base alloys; Zinc base alloys; Mechanical properties; Ti-Zn alloy; Cytocompatibility; Hot-press sintering; Biomedical application
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.167555

To address new challenges in current biomedical titanium alloys, novel binary Ti-Zn alloys with high strength, low elastic modulus, excellent corrosion resistance, and intrinsic bioactivity, were prepared via hot-press sintering. In this paper, the microstructure, mechanical properties, corrosion behaviors, and in vitro biological properties of the Ti-Zn alloys were systematically investigated. The Ti-Zn alloys mainly consist of α-Ti and Ti2Zn phases, in which the Ti2Zn phase plays a good role in precipitation strengthening, and the number gradually increases with increasing the Zn contents. All of the compressive strength, elastic modulus, and nanohardness of the Ti-Zn alloys increase first, and then decrease with increasing the Zn contents. The Ti-Zn alloys show great corrosion resistance with the polarization resistance of more than 104 Ω/cm2, and the resistance continuously increases with increasing the immersion times in SBF solution. The Ti-Zn alloys possess hydrophilic surfaces with contact angles of approximately 34° ∼60°. The concentration of Zn ions released from the Ti-20Zn alloy in 0.9% NaCl solution is much lower than that of the biosafety intake. The Ti-Zn alloys exhibit favorable cytocompatibility, which are very beneficial to the spread, proliferation, and differentiation of the MC3T3-E1 cells. The above-mentioned results suggest the Ti-Zn alloys can be promising candidates for biomedical applications.
•The Ti-Zn alloys were prepared by hot-press sintering with different Zn Contents.•The Ti-Zn alloys are mainly composed of α-Ti and Ti2Zn phases.•The Ti-Zn alloys have high compressive strength and low elastic modulus.•The Ti-Zn alloys have excellent long-term corrosion resistance in SBF solution.•The Ti-Zn alloys have excellent cytocompatibility and biological activity.