Anisotropy of mechanical properties in high-strength ultra-fine-grained pure Ti processed via a complex severe plastic deformation route

Sabirov, I.; Pérez‐Prado, M.T.; Molina-Aldareguia, J.M.; Semenova, Irina P.; Salimgareeva, Gulnaz; Valiev, Ruslan Z.

doi:10.1016/j.scriptamat.2010.09.006

Cited by 82 publications

(35 citation statements)

References 23 publications

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“…It is difficult to attain such ultra-fine grain structures in titanium alloys because of the very rapid rate of grain growth experienced in these alloys, especially at high temperature. However, severe plastic deformation (SPD) techniques such as equal channel angular pressing or high pressure torsion have been utilized to devise sub-micron or even nano-scale structures, albeit only on laboratory scale [1][2]. The major problems encountered with these processes are the limitations placed on size, dimensions and geometry of the components to be manufactured.…”

Section: Introductionmentioning

confidence: 99%

Strain-induced phase transformation during thermo-mechanical processing of titanium alloys

Dehghan-Manshadi

Dippenaar

2012

Materials Science and Engineering: A

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Strain-induced phase transformation studies have been conducted in a Ti-6Al-2Sn-4Zr-6Mo alloy. This alloy was subjected to b sub-transus deformation upon slow cooling from the b-phase field and the effect of strain on the extent and morphology of the phase transformation during hot-deformation was determined. In addition, the transformation kinetics and the morphology of the newly formed a-phase were studied following deformation under different cooling conditions. By applying strain, the rate of the b-to-a phase transformation increased significantly during deformation as well as during slow cooling following deformation. This increase in the kinetics of the b-to-a transformation can be ascribed to straininduced phase transformation. Also, the extent of deformation of the b-phase had a marked effect on the resulting morphology and size of the newly formed a-phase. Transformation of un-deformed b-phase rendered a-phase of acicular morphology only. However, following deformation of the b-phase, acicular as well as globular a-phase morphologies have been observed upon cooling. alloy. This alloy was subjected to β sub-transus deformation upon slow cooling from the β-phase field and the effect of strain on the extent and morphology of the phase transformation during hot-deformation was determined. In addition, the transformation kinetics and the morphology of the newly formed D-phase were studied following deformation under different cooling conditions. By applying strain, the rate of the β-to-α phase transformation increased significantly during deformation as well as during slow cooling following deformation. This increase in the kinetics of the E-to-D transformation can be ascribed to strain-induced phase transformation. Also, the extent of deformation of the β-phase had a marked effect on the resulting morphology and size of the newly-formed D-phase. Transformation of un-deformed β-phase rendered D-phase of acicular morphology only. However, following deformation of the β-phase, acicular as well as globular D-phase morphologies have been observed upon cooling.

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Section: Introductionmentioning

confidence: 99%

Strain-induced phase transformation during thermo-mechanical processing of titanium alloys

Dehghan-Manshadi

Dippenaar

2012

Materials Science and Engineering: A

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“…The UFG material keeps the advantages of cpTi concerning corrosion resistance, biocompatibility and osseointegration and, at the same time, achieves strength levels comparable to those of Ti alloys thanks to the use of the SPD (Severe Plastic Deformation), Figure 10, for grain refinement [3][4][5][6][51][52][53][54][55][56][57][58][59] .…”

Section: Relevance As a Biomaterialsmentioning

confidence: 99%

“…The method also known as Equal-Channel Angular Pressing (ECAP) 5,6,8,51,60,64 . A limitation of this technique is the need of several passes.…”

Section: Spd Processingmentioning

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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“…Various methods of SPD has been successfully applied for grain refinement in pure Ti, such as equal channel angular pressing (ECAP) Ko et al, 2006), high pressure torsion (Sergueeva et al, 2001; and hydrostatic extrusion (Pachla et al, 2008). In particular, nanostructured pure Ti (Grade 4) processed via a complex SPD route consisting of ECAP, swaging and drawing showed yield stress of 1240 MPa along the rod axis (Sabirov et al, 2011). However, as drawback of strong crystallographic texture developed during processing a significant anisotropy of the mechanical properties was obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Gong and Wilkinson (2009) Anisotropy in the mechanical behavior and texture of Ti following ECAP has recently been studied (Sabirov et al, 2011;Korshunov et al, 2008;Meredith and Khan, 2012 …”

Section: Introductionmentioning

confidence: 99%

Standard and strain gradient crystal plasticity models: application to Titanium

Galán¹

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Anisotropy of mechanical properties in high-strength ultra-fine-grained pure Ti processed via a complex severe plastic deformation route

Cited by 82 publications

References 23 publications

Strain-induced phase transformation during thermo-mechanical processing of titanium alloys

Strain-induced phase transformation during thermo-mechanical processing of titanium alloys

Properties and Performance of Ultrafine Grained Titanium for Biomedical Applications

Standard and strain gradient crystal plasticity models: application to Titanium

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