A closer look at the in vitro electrochemical characterisation of titanium alloys for biomedical applications using in-situ methods

Wang, J.-L.; Liu, Ruiliang; Majumdar, Trina; Mantri, S.A.; Ravi, Vilupanur A.; Banerjee, Rajarshi; Birbilis, Nick

doi:10.1016/j.actbio.2017.03.022

Cited by 47 publications

(19 citation statements)

References 39 publications

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“…Concern about the validity of the titanium alloy in biomedical applications arouse the presence of aluminum and vanadium, and its toxicity to living organisms have been well documented [37]. However, specialists in the field of materials and medicine ensure that the occurrence of complications associated with the release of corrosion products to the tissues surrounding the implant is negligible, as titanium and its alloys undergo spontaneous surface passivation [38].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Energy Density, Internal Porosity and Heat Treatment on Mechanical Behavior of Biomedical Ti6Al4V Alloy Obtained with DMLS Technology

Mierzejewska

2019

Materials

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The purpose of this paper was to determine the influence of selected parameters of Direct Metal Laser Sintering and various heat treatment temperatures on the mechanical properties of Ti6Al4V samples oriented vertically (V, ZX) and horizontally (H, XZ). The performed micro-CT scans of as-build samples revealed that the change in laser energy density significantly influences the change in porosity of the material, which the parameters (130–210 W; 300–1300 mm/s), from 9.31% (130 W, 1300 mm/s) to 0.16% (190 W, 500 mm/s) are given. The mechanical properties, ultimate tensile strength (UTS, Rm) and yield strength (YS, Re) of the DMLS as-build samples, were higher than the ASTM F 1472 standard suggestion (UTS = 1100.13 ± 126.17 MPa, YS = 1065.46 ± 127.91 MPa), and simultaneously, the elongation at break was lower than required for biomedical implants (A = 4.23 ± 1.24%). The low ductility and high UTS were caused by a specific microstructure made of α’ martensite and columnar prior β grains. X-Ray Diffraction (XRD) analysis revealed that heat treatment at 850 °C for 2 h caused the change of the microstructure intothe α + β combination, affecting the change of strength parameters—a reduction of UTS and YS with the simultaneous increase in elongation (A). Thus, properties similar to those indicated by the standard were obtained (UTS = 908.63 ± 119.49 MPa, YS = 795.9 ± 159.32 MPa, A = 8.72 ± 2.51%), while the porosity remained almost unchanged. Moreover, the heat treatment at 850 °C resulted in the disappearance of anisotropic material properties caused by the layered structure (UTSZX = 908.36 ± 122.79 MPa, UTSXZ = 908.97 ± 118.198 MPa, YSZX = 807.83 ± 124.05 MPa, YSXZ = 810.56 ± 124.05 MPa, AZX = 8.75 ± 2.65%, and AXZ = 8.68 ± 2.41%).

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Section: Introductionmentioning

confidence: 99%

Effect of Laser Energy Density, Internal Porosity and Heat Treatment on Mechanical Behavior of Biomedical Ti6Al4V Alloy Obtained with DMLS Technology

Mierzejewska

2019

Materials

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“…It was found that albumin blocks dissolution in the first few hours of exposure but increased corrosion was observed over longer exposures 49 . As biomolecules such as albumin and H 2 O 2 are present in inflamed peri-implant tissue, these observations raise the question of whether standard testing should be complemented by testing in more realistic environments, over more realistic time periods, and using enhanced corrosion characterisation methods rather than standard polarisation curves 50 .…”

Section: Discussionmentioning

confidence: 99%

Time-dependent Enhanced Corrosion of Ti6Al4V in the Presence of H2O2 and Albumin

Zhang

Addison

et al. 2018

Sci Rep

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There is increasing concern regarding the biological consequences of metal release from implants. However, the mechanisms underpinning implant surface degradation, especially in the absence of wear, are often poorly understood. Here the synergistic effect of albumin and H2O2 on corrosion of Ti6Al4V in physiological saline is studied with electrochemical methods. It is found that albumin induces a time-dependent dissolution of Ti6Al4V in the presence of H2O2 in physiology saline. Potentiostatic polarisation measurements show that albumin supresses dissolution in the presence of H2O2 at short times (<24 h) but over longer time periods (120 h) it significantly accelerates corrosion, which is attributed to albumin-catalysed dissolution of the corrosion product layer resulting in formation of a thinner oxide film. Dissolution of Ti6Al4V in the presence of albumin and H2O2 in physiological saline is also found to be dependent on potential: the titanium ion release rate is found to be higher (0.57 µg/cm2) at a lower potential (90 mV), where the oxide capacitance and resistance inferred from Electrochemical Impedance Spectroscopy also suggests a less resistant oxide film. The study highlights the importance of using more realistic solutions, and considering behaviour over longer time periods when testing corrosion resistance of metallic biomaterials.

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“…The investigations related to the corrosion of AM-prepared Ti alloys reviewed in this work are summarized in Table 6. [68][69]84,[113][114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130][131][132] The work performed by Dai, et al, 84,113 analyzes the corrosion characteristics of Ti6Al4V alloys produced by SLM in different chloride-containing media. The authors evaluated the corrosion of SLM Ti6Al4V by altering exposed planes to different electrolytes 84 and by post-build heat treatments.…”

Section: Titanium Alloysmentioning

confidence: 99%

“…Corrosion of a varied group of alloys-SLM Ti6Al4V, DLD 50Ti-35Nb-15Zr, DLD 67Ti-25Nb-8Zr, and DLD pure Ti-was investigated by Wang, et al, 132 in MEM. The AM Ti alloys analyzed by Wang, et al, were compared to wrought Ti6Al4V, commercially produced pure Ti, and a custom cast Ti-29Nb-13Ta-4.5Zr alloy.…”

Section: Titanium Alloysmentioning

confidence: 99%

Corrosion of Additively Manufactured Alloys: A Review

et al. 2018

Self Cite

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Additive manufacturing (AM), often termed 3D printing, has recently emerged as a mainstream means of producing metallic components from a variety of metallic alloys. The numerous benefits of AM include net shape manufacturing, efficient use of material, suitability to low volume production runs, and the ability to explore alloy compositions not previously accessible to conventional casting. The process of AM, which is nominally performed using laser (or electron) based local melting, has a definitive role in the resultant alloy microstructure. Herein, the corrosion of alloys prepared by AM using laser and electronbased methods, relating the corrosion performance to the microstructural features influenced by AM processing, are reviewed. Such features include unique porosity, grain structures, dislocation networks, residual stress, solute segregation, and surface roughness. Correlations between reported results and deficiencies in present understanding are highlighted.

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A closer look at the in vitro electrochemical characterisation of titanium alloys for biomedical applications using in-situ methods

Cited by 47 publications

References 39 publications

Effect of Laser Energy Density, Internal Porosity and Heat Treatment on Mechanical Behavior of Biomedical Ti6Al4V Alloy Obtained with DMLS Technology

Effect of Laser Energy Density, Internal Porosity and Heat Treatment on Mechanical Behavior of Biomedical Ti6Al4V Alloy Obtained with DMLS Technology

Time-dependent Enhanced Corrosion of Ti6Al4V in the Presence of H2O2 and Albumin

Corrosion of Additively Manufactured Alloys: A Review

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