Tensile and Corrosion Properties of Anodized Ultrafine?Grained Ti?13Nb?13Zr Biomedical Alloy Obtained by High?Pressure Torsion

Dragana Barjaktarević; Bojan Medjo; Primož Štefane; Nenad Gubeljak; Ivana Cvijović‑Alagić; Veljko Djokić; Marko Rakin

doi:10.1007/s12540-020-00837-z

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자료유형: 학술저널

저자정보: Dragana Barjaktarević (University of Belgrade) Bojan Medjo (University of Belgrade) Primož Štefane (University of Maribor) Nenad Gubeljak (University of Maribor) Ivana Cvijović‑Alagić (University of Belgrade) Veljko Djokić (University of Belgrade) Marko Rakin (University of Belgrade)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9

발행연도: 2021.9

수록면: 3,325 - 3,341 (17page)

DOI: 10.1007/s12540-020-00837-z

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Severe plastic deformation (SPD) is a popular group of techniques applied to achieve the nanostructuring of the metallic biomaterials and improvement of their mechanical characteristics. One of the most commonly used SPD methods is the highpressure torsion (HPT) technique which enables the obtainment of the microstructure with small grains and high strength. In the present study, the influence of the plastic deformation and surface modification treatment on the tensile and corrosion properties of the Ti?13Nb?13Zr (wt%) alloy is investigated. In that purpose, the coarse-grained (CG) Ti?13Nb?13Zr (TNZ) alloy was subjected to the HPT processing by applying a pressure of 4.1 GPa with a rotational speed of 0.2 rpm and 5 revolutions at room temperature to obtain the ultrafine-grained (UFG) microstructure. The alloy microstructure before and after HPT processing was analysed using the scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The homogeneity of the UFG TNZ alloy was determined by microhardness testing and microscopic observations. The nanotubular oxide layer on the surface of the TNZ alloy, both in CG and UFG condition, was formed by electrochemical anodization in 1 M H3PO4 + NaF electrolyte for 90 min. SEM analysis was used to characterise the morphology of the anodized surfaces, while energy dispersive spectroscopy was applied to determine the chemical composition of the nanostructured layers formed at the alloy surfaces. Mechanical properties of the TNZ alloy, before and after HPT processing and electrochemical anodization, were determined by tensile testing. After tensile testing, the fractographic analysis was conducted to identify the fracture mechanisms. The potentiodynamic polarization technique was used to determine the corrosion resistance of the alloy before and after plastic deformation and surface modification treatment. The obtained results showed that the alloy is reasonably homogeneous after the HPT processing. The XRD analyses reviled the presence of α′ and β phases in the CG TNZ alloy microstructure, while the additional ω phase was detected in the microstructure of the UFG TNZ alloy. The HPT obtained alloy exhibits higher hardness and improved tensile properties than the alloy in the as-received CG condition, while the electrochemical anodization leads to a decrease of its mechanical properties. Both CG and UFG alloys show excellent corrosion stability in Ringer’s solution. Moreover, electrochemical anodization leads to a decrease or an increase of the corrosion resistance of these materials, depending on the morphology of the formed nanotubular surface layers. The results indicate that the anodized CG TNZ alloy is characterized by a lower modulus of elasticity and better corrosion resistance properties than the anodized UFG TNZ alloy.

#Ti?13Nb?13Zr alloy #High-pressure torsion #Ultrafine-grained biomaterial #Anodized surface #Corrosion resistance #Tensile properties

참고문헌 (3)

참고문헌 신청

M. Wroński / 2018 / Microstructure, Texture and Mechanical Properties of Titanium Grade 2 Processed by ECAP (Route C) / Metals and Materials International 24(4):802~814

Cora Vasilescu / 2015 / Surface Analysis, Microstructural, Mechanical and Electrochemical Properties of New Ti-15Ta-5Zr Alloy / Metals and Materials International 21(2):242~250

Viswanathan S. Saji / 2011 / The Effect of Post-Heat Treatment on the Ion Dissolution Behavior of Nanotubular Titanium Alloys / Metals and Materials International 17(2):275~278

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