An approach for room-temperature multi-directional forging of pure titanium for strengthening

Miura, Hiromi; Kobayashi, Masakazu; Aoba, Tomoya; Aoyama, Hiroshi; Benjanarasuth, T.

doi:10.1016/j.msea.2018.06.060

Cited by 36 publications

(24 citation statements)

References 25 publications

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“…An MDF-Ti disk (ϕ: 15 mm; thickness: 1.0 mm; JIS 2 type; 99.9% mass; Kawamoto Heavy Industries, Hyogo, Japan) 18,19) was compared to a commercially available pure Ti disk (ϕ: 15 mm; thickness: 1.0 mm; JIS 2 type; 99.9% mass; Furuuchi Chemical, Tokyo, Japan). MDF-Ti possesses an ultrafine-grained structure with high dislocation density, whereas the latter is coarse grained and with much lower dislocation density.…”

Section: Titanium Substratementioning

confidence: 99%

“…On the contrary, decreasing the grain size can induce strengthening of the metallic material without the addition of any alloying elements, which is known as the Hall-Petch relation [11][12][13] . There are several methods for decreasing grain size by severe plastic deformation, such as accumulative roll bonding 14) , high pressure torsion 15) , equal channel angular pressing (ECAP) 16) , and multi-directional forging (MDF) [17][18][19] . Particularly, MDF is a useful method for preparing large samples, and there is little limitation of the shape, too.…”

Section: Introductionmentioning

confidence: 99%

“…Forging strain was repeatedly applied while changing the forging axis as illustrated. Miura et al applied the MDF method to Ti or magnesium alloys and reported their ultrafine-grained structures and notably high tensile strengths 18,19) . Transmission electron microscope observation revealed ultrafine-grained structure of MDFed pure titanium (MDF-Ti) 19) .…”

Section: Introductionmentioning

confidence: 99%

“…Miura et al applied the MDF method to Ti or magnesium alloys and reported their ultrafine-grained structures and notably high tensile strengths 18,19) . Transmission electron microscope observation revealed ultrafine-grained structure of MDFed pure titanium (MDF-Ti) 19) . For example, average grain size and the ultimate tensile strength of MDF-Ti grade 2 were finer than 100 nm and more than 1 GPa.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical property and corrosion behavior of multi-directionally forged titanium in fluoride solution

et al. 2019

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Multi-directional forging (MDFing) can improve the various properties of metals and alloys due to the evolution of an ultrafinegrained structure. In the present study, electrochemical properties and corrosion behaviors in a fluoride solution of MDFed pure titanium (MDF-Ti) were evaluated by comparing with conventional coarse-grained pure titanium (Ti). The Eopen value of MDF-Ti was significantly higher than that of Ti. However, similar potentiodynamic polarization profiles were obtained for Ti and MDF-Ti. Immersion in NaF solution caused no severe corrosion to Ti or MDF-Ti. However, immersion in acidulate phosphate fluoride solution (APF) revealed that MDF-Ti had better corrosion resistance than Ti at shorter time immersion periods and was more susceptible to corrosion for longer immersion. Significantly less release of titanium was observed for MDF-Ti in shorter immersion periods in APF. In conclusion, MDF-Ti showed similar electrochemical behaviors to Ti and less susceptible to corrosion in shorter time APF immersion.

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Section: Titanium Substratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical property and corrosion behavior of multi-directionally forged titanium in fluoride solution

et al. 2019

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“…However, these HPT or ECPA methods were carried out at elevated temperatures for enhancing slip deformation. Miura et al successfully applied the MDF method to Ti at room temperature and reported ultrafine-grained structures and remarkably higher tensile strengths [24]. Multi-directional forging is also useful method for preparing large samples, and there is little limitation of the shape.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Treatment of Multi-Directionally Forged (MDF) Titanium Implant on Bone Response

Suzuki

Hirota

Hoshi

et al. 2019

Metals

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Multi-directional forging (MDFing) of titanium drastically improved its mechanical properties due to the evolution of an ultrafine-grained structure. Forging strain was repeatedly applied while changing the forging axis during MDFing. Of note is the decreased elastic modulus of MDFed titanium (MDF-Ti) as compared to conventional coarse-grained pure Ti (Ti). In the present study, we evaluated bone’s response toward surface-treated MDF-Ti after implantation into the extraction sockets of rat maxillary molars. As surface treatments, acid (Acid, sulfuric acid at 120 °C for 75 s), alkali without post-heat (Alkali, NaOH at 60 °C for 24 h), and alkali with post-heat (Alkali-heat, subsequent heating at 600 °C for 1 h) treatments were employed. The presence of minute nanoscale dimples in the microscale dimples to form regular fractal structures on MDF-Ti surfaces was observed after Acid treatments. Structures of sponge-like porous networks after Alkali treatments and submicron fiber networks after Alkali-heat treatment were produced on the surfaces of both Ti and MDF-Ti. Surface-treated specimens were superhydrophilic. More crystal deposition was clearly observed on each surface-treated specimen after immersion in simulated body fluid for both Ti and MDF-Ti. The bone-to-implant contact (BIC) ratios of the Acid and Alkali-heat specimens were significantly higher than those of the untreated control (p < 0.05). Moreover, Acid and Alkali-heat treatment for MDF-Ti caused significantly greater BICs than that for Ti (p < 0.05). In conclusion, Acid or Alkali-heat treatment of MDF-Ti is useful for improving bone response.

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Microstructural Evolution and Mechanical Properties of Ultrafine‐Grained Ti Fabricated by Cryorolling and Subsequent Annealing

Wang

Yan

et al. 2020

Adv Eng Mater

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showed that the strength and microhardness of UFG Ti follow the conventional Hall-Petch relationship. [10] Several severe plastic deformation (SPD) techniques have been used to fabricate UFG samples, including Ti, such as highpressure torsion (HPT), [11-13] multidirectional forging, [14] friction stir welding, [15] equal-channel angular pressing (ECAP), [5,16,17] and special rolling technology. [18,19] It was reported that the strength of UFG Ti processed by HPT reached %1200 MPa [11] and there was a strength of %930 MPa in UFG Ti fabricated by multiforging and subsequent rolling. [14] There is a report that the mechanical properties and corrosion resistance of CP Ti after continuous ECAP plus short-duration annealing was comparable with the as-received sheets [20] and UFG Ti prepared by ECAP þ rolling had a higher strength than Ti-6Al-4V alloys. [21] Recently, a shear drawing technique was developed to fabricate UFG Ti bars and the results showed that the strength was improved to %590 MPa compared with %470 MPa in conventional drawing. [22] Deformation at cryogenic temperature may further refine the grain size compared with deformation at room temperature (RT). Aluminum alloys [23-25] and copper alloys [26-28] showed high

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An approach for room-temperature multi-directional forging of pure titanium for strengthening

Cited by 36 publications

References 25 publications

Electrochemical property and corrosion behavior of multi-directionally forged titanium in fluoride solution

Electrochemical property and corrosion behavior of multi-directionally forged titanium in fluoride solution

Effect of Surface Treatment of Multi-Directionally Forged (MDF) Titanium Implant on Bone Response

Microstructural Evolution and Mechanical Properties of Ultrafine‐Grained Ti Fabricated by Cryorolling and Subsequent Annealing

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