Strength and fatigue properties enhancement in ultrafine-grained Ti produced by severe plastic deformation

Semenova, Irina P.; Valiev, Ruslan Z.; Yakushina, E.; Salimgareeva, G.H.; Lowe, Terry C.

doi:10.1007/s10853-008-2984-4

Cited by 75 publications

(40 citation statements)

References 9 publications

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“…The H-P relationship for Ti; [81] grades 1 to 4 denote increasing orders of impurities for Fe, N and O and using experimental data. [81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99][100] Figure 4. The H-P relationship for coarse-grained and HPT processed Al-5% Mg; [103] with increasing numbers of turns, HAGBs develop and the H-P relationship is followed so that data from coarse grain samples fall on the same line as HPT specimens.…”

Section: Figure Captionsmentioning

confidence: 99%

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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Metals processed by severe plastic deformation [SPD] techniques, such as equal-channel angular pressing [ECAP] and high-pressure torsion [HPT], generally have submicrometer grain sizes. Consequently, they exhibit high strength as expected on the basis of the HallPetch [H-P] relationship. Examples of this behavior are discussed using data on Ti, Al-Mg 1 and Ni. These materials typically have grain size above ~50 nm where softening is not expected. An increase in strength is usually accompanied by a decrease in ductility. High strength and ductility can be achieved simultaneously by imposing high strains to give both ultrafine grain sizes and a high fraction of high-angle grain boundaries. An example is presented for a cast Al-7% Si alloy processed by HPT. In some cases, SPD may produce a fine grain size but also lead to a weakening due to microstructural changes as in ECAP of an Al-7034 alloy and HPT of Zn-22% Al. In SPD-processed materials, grain boundary segregation and nanostructural features are present which may lead to higher strengths than those predicted by the H-P relationship in some alloys having nano grain sizes.

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Section: Figure Captionsmentioning

confidence: 99%

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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“…Thus, a very large strain may be imposed on materials via repeated severe plastic deformation processing. The ultrafine-grained (UFG) materials produced by severe plastic deformation often possess extraordinary properties, including both high strength and toughness [9], long fatigue life [10,11] and reasonable wear resistance [12,13]. To date, various severe plastic deformation processing methods have been applied successfully for the production of high strength pure Ti [6,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Indentation and scratch testing of DLC-Zr coatings on ultrafine-grained titanium processed by high-pressure torsion

Wang

Escudeiro

Polcar

et al. 2013

Wear

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High-pressure torsion was employed to refine the microstructure of grade 2 Ti under an imposed pressure of 3.0 GPa at room temperature. The microhardness of grade 2 Ti increased from 1.82 GPa for the coarse grain state to 3.05 GPa after high-pressure torsion processing, where this value is very close to the hardness of the Ti-6Al-4V alloy.Subsequently, several diamond-like carbon (DLC) coatings with thicknesses of ~1.4 Pm were deposited on as-received Ti, high-pressure torsion processed Ti and Ti-6Al-4V samples via physical vapour deposition. Both indentation and scratch tests showed a much improved adhesion of DLC-7Zr, DLC:H-7Zr and DLC-9Zr coatings with high-pressure torsion processed Ti as the substrate by comparison with the same coatings on coarse-grained Ti. The results suggest that commercial pure Ti processed by high-pressure torsion and coated with a diamond-like carbon coating provides a potential candidate material for bio-implant applications.

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“…After annealing above 200 °C, a rearrangement of defects promotes high angle grain boundaries with very high dislocation densities, above 10 14 /cm 2 , which indicates the non-equilibrium character of such grain boundaries after annealing 69 . In another case of UFG Ti grade 4 produced by four-pass ECAP, which was then processed by forge-drawing at 300 °C (TMT), the ultimate strength increased from 700 to 1240 MPa [70] . An additional isothermal straining at 450 °C of the previous (ECAP + TMT) UFG Ti, enhanced both the strength, up to 1420 MPa, and the ductility, up to 12%.…”

Section: Microstructurementioning

confidence: 99%

“…As a result of grain size reduction to nanometric values (Figure 10), the strength of the distinct grades, 1 to 4, of cpTi is significantly improved by SPD processing, as shown in Table 1 [70][71][72][73] . In this table, it should be noted that marked increases in both the yield and the ultimate strength of cpTi have been achieved through special processing involving not only multiple passes (ECAP) but also annealing and isothermal straining.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Properties and Performance of Ultrafine Grained Titanium for Biomedical Applications

2015

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The use of materials for biomedical applications has become vital to enhance the quality of life and longevity of human beings. Commercially pure titanium (cpTi) and titanium alloys are the most adequate materials for some biomedical applications, but cpTi and the Ti-6Al-4V alloy (Ti G5) have limitations for biomedical application due to low mechanical strength and the possibility of ion release, respectively. In order to address this problem, commercially pure ultrafine grained titanium (UFG Ti) obtained by severe plastic deformation (SPD) has been suggested as a promising alternative for biomedical applications. This thermomechanical process is able to improve the strength of cpTi and titanium alloys while keeping their excellent biocompatibility. The purpose of this review was to compare the mechanical strength of UFG Ti, cpTi and a Ti G5 alloy. In addition, the biological performance of UFG Ti was also evaluated by in vivo testing. Prodigious improvements were seen in surface topography, wettability and in homogeneity of oxide layer. The overall improvements in microstructure provided by ECAP technique coupled with surface etching resulted in a remarkable performance of cpTi alloy for biomedical applications.

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Strength and fatigue properties enhancement in ultrafine-grained Ti produced by severe plastic deformation

Cited by 75 publications

References 9 publications

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Indentation and scratch testing of DLC-Zr coatings on ultrafine-grained titanium processed by high-pressure torsion

Properties and Performance of Ultrafine Grained Titanium for Biomedical Applications

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