Study on Corrosion Behavior of Ultrafine-Grained Ti-6Al-7Nb Fabricated by Equal Channel Angular Pressing

Yu, Zequn; Dong, Yuecheng; Li, Xin; Niu, Jitai; Alexandrov, Igor; Chang, Hui

doi:10.3390/met10070950

Cited by 12 publications

(7 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Then, they can effectively protect the substrate from the attack of chloride ions in the solution and increase the corrosion resistance of the ECAPed titanium alloy. This is consistent with previous results reported by Sotniczuk et al [ 32 ] and Yu Z et al [ 25 ]. Generally speaking, the higher stored energy, the less stable the material, intergranular corrosion is easier to start and extend at HAGBs [ 17 , 33 ].…”

Section: Resultssupporting

confidence: 94%

“…It can be seen that the ECAPed sample is more susceptible to passivation, and the area where passivation occurs is much wider. For the same material, the corrosion rate ( R ) is proportional to the i corr and can be computed by Equation (1) [ 25 ]:

where R is the corrosion rate (mm/a), A is the atomic weight, i corr is the corrosion current density (μA/cm 2 ), n is the chemical valence and ρ is the density (g/cm 2 ).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Equal Channel Angular Pressing on Mechanical Behavior and Corrosion Resistance of Hot-Rolled Ti-2Fe-0.1B Alloy

Wang

Alexandrov

et al. 2020

Materials

Self Cite

View full text Add to dashboard Cite

In the present study, the unique bimodal grain size distribution microstructure with the ultrafine substrate and embedded macro grains was fabricated by a traditional hot-rolling process in a novel low-cost Ti-2Fe-0.1B titanium alloy, which possesses a good combination of strength (around 663 MPa) and ductility (around 30%) without any post heat treatment. Meanwhile, the mechanical behavior and corrosion resistance of hot-rolled Ti-2Fe-0.1B alloy after equal channel angular pressing (ECAP) deformation were studied. Results indicated that the average grain size decreased to 0.24 μm after 4 passes ECAP deformation, which led to the enhancement of tensile strength to around 854 MPa and good ductility to around 15%. In addition, corrosion resistance was also improved after ECAP due to the rapid self-repairing and thicker passivation film. Our study revealed that the novel low-cost titanium alloy after hot-rolling and ECAP could be used instead of Ti-6Al-4V in some industrial applications due to similar mechanical behavior and better corrosion resistance.

show abstract

Section: Resultssupporting

confidence: 94%

where R is the corrosion rate (mm/a), A is the atomic weight, i corr is the corrosion current density (μA/cm 2 ), n is the chemical valence and ρ is the density (g/cm 2 ).…”

Section: Resultsmentioning

confidence: 99%

Impact of Equal Channel Angular Pressing on Mechanical Behavior and Corrosion Resistance of Hot-Rolled Ti-2Fe-0.1B Alloy

Wang

Alexandrov

et al. 2020

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…CPE 1 (CPE 2 ) indicated the constant phase element of passivation film (the electric double layer). 33…”

Section: Resultsmentioning

confidence: 99%

“…CPE 1 (CPE 2 ) indicated the constant phase element of passivation film (the electric double layer). 33 The fitted electrochemical parameters, extracted from EIS data with lower than 4% error, are shown in Table 3. The fitted and experimental data were well-matched, as shown by the low X2 value of about 0.01.…”

Section: Electrochemical Testsmentioning

confidence: 99%

Commercially pure titanium modification to enhance corrosion behavior and osteoblast response by ECAP for biomedical applications

Hashemi

Borhani

Nourbakhsh

2022

Journal of Applied Biomaterials & Functional Materials

View full text Add to dashboard Cite

When it comes to using bio-metals, the chemical and biocompatibility properties of titanium led to its widespread use in biomedical implants. However, pure titanium possesses lower mechanical properties than Ti alloys containing cytotoxic elements. Severe plastic deformation (SPD) techniques were able to cause a significant strength increase, corrosion behavior improvement, and the release of the alloying elements. In this study, the ECAP process was performed on commercially pure titanium with a square cross-section at two and four passes, which resulted in a finer grain size and a more uniform microstructure. In order to improve cell behaviors, etch treatment was performed to produce nano-rough and nano-texture surfaces for all Ti samples. The effect of surface etching on corrosion, surface roughness, and cell behaviors on ECAP and untreated samples was also investigated. Optical/Field Emission Scanning Electron Microscopy, Atomic Force Microscopy, and X-Ray Diffraction were used to study the microstructural characterizations of samples. In addition, the impact of grain structure on the contact angle, electrochemical corrosion behavior, osteoblast response, and cell viability was investigated. The titanium that was ECAPed four times provided finer grains (200 nm) than the unprocessed sample (25 µm). The potentiodynamic polarization test revealed that corrosion resistance of ECAPed samples was enhanced, which was associated with grain refinement, affecting the passive film formation. Corrosion resistance and wettability experienced an apparent increase after each ECAP pass. In conclusion, improvement of grain size and surface roughness was due to the simultaneous effect of ECAP and etching treatment that led to the osteoblast response and cellular activity of samples.

show abstract

“…[ 5,18,19 ] Significant improvement in the alloy performance is possible due to the hardening of the surface layer through forming oxide layers by isothermal oxidation. [ 20–23 ]…”

Section: Introductionmentioning

confidence: 99%

Investigating the thermal oxidation behavior of Ti–6Al–7Nb alloy in dry air

Mohamed

Elmomen

El‐Hadad

2022

Materials & Corrosion

View full text Add to dashboard Cite

The thermal oxidation behavior of a forged Ti–6Al–7Nb (Ti67) alloy was investigated in dry air conditions. The alloy specimens were oxidized for 50 h at different temperatures (650°C, 750°C, and 850°C) and the oxidation kinetics were analyzed. The microstructure of Ti67 after oxidation and the different phases and compounds were identified. A parabolic equation based on weight gain was used to define the oxidation rate. The parabolic rate constant increased from 1.10 × 10−8 at 650°C to 2.10 × 10−8 and 1.53 × 10−7 g2/(cm4·h) at 750°C and 850°C, respectively. At 650°C, the oxidation behavior resumed the parabolic behavior until 40 h, a breakaway phenomenon. At 750°C, a linear behavior was observed in the periods of 20–50 h. This linear trend appeared also after 35–50 h at 850°C. The activation energy was found to be 238.4 kJ/mole. At the lowest oxidation temperature (650°C), a disconnected oxide layer was observed. These variations in the response of Ti67 alloy to the different thermal oxidation conditions are worthy of consideration when modifying the surfaces for biomedical applications.

show abstract

Study on Corrosion Behavior of Ultrafine-Grained Ti-6Al-7Nb Fabricated by Equal Channel Angular Pressing

Cited by 12 publications

References 40 publications

Impact of Equal Channel Angular Pressing on Mechanical Behavior and Corrosion Resistance of Hot-Rolled Ti-2Fe-0.1B Alloy

Impact of Equal Channel Angular Pressing on Mechanical Behavior and Corrosion Resistance of Hot-Rolled Ti-2Fe-0.1B Alloy

Commercially pure titanium modification to enhance corrosion behavior and osteoblast response by ECAP for biomedical applications

Investigating the thermal oxidation behavior of Ti–6Al–7Nb alloy in dry air

Contact Info

Product

Resources

About