Microstructure and properties of pure Ti processed by ECAP and cold extrusion

Stolyarov, V. V.; Zhu, Yuntian; Lowe, Terry C.; Valiev, Ruslan Z.

doi:10.1016/s0921-5093(00)01884-0

Cited by 287 publications

(164 citation statements)

References 18 publications

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“…Typical SPD processes that decompose the microstructure of bulk samples into nanostructures include equal channel angular pressing (ECAP) and high pressure torsion, performed at room temperature (RT) or elevated temperatures. [1][2][3][4] The eventual grain size reached for a pure metal such as Cu is usually a few hundred nanometers, slightly beyond the 100 nm conventionally defined as the demarcation line of the nanocrystalline (nc) regime. [1][2][3][4][5] In addition to the large plastic strains provided by the SPD processes, there are other factors that are known to promote grain refinement down to the nc range.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Wang

Jiao

2003

Mater. Trans.

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The dynamic grain refinement behavior upon severe plastic deformation has been systematically studied in commercial purity copper that was heavily cold rolled to large deformations at cryogenic temperatures. The low-temperature rolling allows the accumulation of extraordinarily high densities of dislocations in Cu, enabling an investigation of the various dynamic recrystallization phenomena upon further deformation. The eventual steady-state grain sizes achieved, as well as the dynamic recrystallization mechanisms, are studied using controlled deformation tests combined with transmission electron microscopy. The dominant mechanisms observed to contribute to grain refinement in Cu include the classical migration dynamic recrystallization process, the deformation twinning, as well as the continuous dynamic recrystallization via progressive lattice rotation upon deformation to extremely large strains. The strain rate and deformation temperature have strong effects on the operative mechanisms and the grain sizes achieved in the ultrafine and nanocrystalline regimes.

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Section: Introductionmentioning

confidence: 99%

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Wang

Jiao

2003

Mater. Trans.

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“…Ti6Al4V, have increasing applications in biomedical devices due to their excellent mechanical and biological performance [1]. Alloying elements such as Al and V are toxic and may potentially cause a series of ailments including cancer [2]. Thus the use of commercially pure (CP) Ti would be desirable.…”

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confidence: 99%

“…ECAP plus cold deformation [2,11] can further refine the grains and improve the strength. Shin et al [12] have reported that the main deformation mechanisms of CP Ti during the first and the second ECAP pass at 623 K are {1 0 1 1} twinning and dislocation slip.…”

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confidence: 99%

Microstructure evolution of commercial pure titanium during equal channel angular pressing

Chen

Walmsley

et al. 2010

Materials Science and Engineering: A

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“…Since the above equations require the introduction of values for D and L, the of the Ti6-4 alloy has not yet been reached, the combination of properties here obtained is very good. Indeed; whilst the tensile strength obtained by Stolyarov et al 6,18 is higher, the corresponding ductility is quite low, with total elongation below 10%.…”

Section: Resultsmentioning

confidence: 86%

The effects of severe plastic deformation on some properties relevant to Ti implants

2011

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In some types of surgical implants, such as bone screws and plates, Grade 2 Ti is seriously considered as a replacement for the Ti-6Al-4V alloy. Advantages are lower cost and the absence of Al and V, which have been identified as potentially harmful to human health. The present paper shows that the lower strength of the commercially pure metal can be enhanced by Severe Plastic Deformation followed by conventional cold rolling, so as to reach a strength level higher than the technical requirements applicable to the alloy. This was ascertained by tensile and Vickers hardness tests from which it was concluded that the best combination of properties are obtained by submitting the metal to Equal Channel Angular Pressing (four passes at 300 °C) followed by a 70% thickness reduction by cold rolling. Although the present results are valid for the material only, and not for the product considered, that is, bone screws, it appears that this solution is a step towards the replacement of the Ti6-4 alloy by Grade 2 Ti, at least for some types of metallic medical implants.

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Microstructure and properties of pure Ti processed by ECAP and cold extrusion

Cited by 287 publications

References 18 publications

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Microstructure evolution of commercial pure titanium during equal channel angular pressing

The effects of severe plastic deformation on some properties relevant to Ti implants

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