scholarly journals Mechanical Strength and Biocompatibility of Ultrafine-Grained Commercial Purity Titanium

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yuri Estrin ◽  
Hyoun-Ee Kim ◽  
Rimma Lapovok ◽  
Hoi Pang Ng ◽  
Ji-Hoon Jo
Keyword(s):  
Mechanical Performance ◽  
Bone Tissue Regeneration ◽  
Processing Route ◽  
Commercial Purity ◽  
Angular Pressing ◽  
Commercial Purity Titanium ◽  
Conventional Titanium Alloy ◽  
Purity Titanium

The effect of grain refinement of commercial purity titanium by equal channel angular pressing (ECAP) on its mechanical performance and bone tissue regeneration is reported.In vivostudies conducted on New Zealand white rabbits did not show an enhancement of biocompatibility of ECAP-modified titanium found earlier byin vitrotesting. However, the observed combination of outstanding mechanical properties achieved by ECAP without a loss of biocompatibility suggests that this is a very promising processing route to bioimplant manufacturing. The study thus supports the expectation that commercial purity titanium modified by ECAP can be seen as an excellent candidate material for bone implants suitable for replacing conventional titanium alloy implants.

scholarly journals Commercial Purity Titanium Processed by Rotary-Die Equal Channel Angular Pressing Method

2005 ◽  
Vol 46 (9) ◽  
pp. 2098-2101 ◽  
Author(s):  
Akira Watazu ◽  
Ichinori Shigematsu ◽  
Aibin Ma ◽  
Kazutaka Suzuki ◽  
Tsunemichi Imai ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Commercial Purity ◽  
Pressing Method ◽  
Angular Pressing ◽  
Commercial Purity Titanium ◽  
Purity Titanium

Contribution of Twins to the Strengthening of Commercial Purity Titanium after Equal-Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 719-724 ◽  
Author(s):  
Yue Zhang ◽  
Saleh N. Alhajeri ◽  
Roberto B. Figueiredo ◽  
Nong Gao ◽  
Jing Tao Wang ◽  
...  
Keyword(s):  
Yield Strength ◽  
Equal Channel Angular Pressing ◽  
Tensile Tests ◽  
Coarse Grained ◽  
Commercial Purity ◽  
Angular Pressing ◽  
Commercial Purity Titanium ◽  
Elongation To Failure ◽  
Mechanical Twins ◽  
Purity Titanium

Room temperature equal-channel angular pressing (ECAP) was employed on commercial purity titanium in the present work. Mechanical twining was observed in ~90% grains while the grains were not significantly refined (~10 μm) after ECAP. TEM observations showed that the twins observed under OM are usually composed of a serial of parallel twin bands with a width of ~1 μm. Microhardness and tensile tests showed that such a coarse-grained microstructure combined with a high fraction of mechanical twins has a microhardness of ~ 240 Hv, yield strength of ~ 730 MPa, tensile strength of ~ 740 MPa and elongation to failure of ~ 16%. This yield strength is much higher than 620-640 MPa, the yield strength of ultrafine-grained titanium by 8~12 passes of ECAP at 450 oC with a grain size of 200-300 nm, and is close to ~ 790 MPa, the yield strength of commercial Ti-6Al-4V alloys.

Workability Limits of Commercial Purity Titanium Subjected to Equal Channel Angular Pressing

2008 ◽  
Vol 584-586 ◽  
pp. 275-280 ◽  
Author(s):  
G.V. Preetham Kumar ◽  
Chakkingal Uday
Keyword(s):  
Equal Channel Angular Pressing ◽  
Biomedical Applications ◽  
Processing Route ◽  
Commercial Purity ◽  
Specific Strength ◽  
Warm Working ◽  
Angular Pressing ◽  
High Specific Strength ◽  
Commercial Purity Titanium ◽  
Cp Ti

Commercial purity Ti is an important candidate material for orthopedic and dental implants because of its high specific strength, good corrosion resistance and excellent biocompatibility. However, for biomedical applications as a replacement for Ti-6Al-4V alloy that is currently used, improvement in strength of CP Ti is necessary. This can be achieved by using severe plastic deformation (SPD) processes like equal channel angular pressing (ECAP) at warm working temperatures followed by conventional processing at room temperatures. This requires adequate workability after ECAP. In this study, the workability of CP Ti after warm ECAP has been investigated. Specimens of CP Ti, 17 mm in diameter, were extruded using processing route Bc through an ECAP die with an angle of 120◦ between the two intersecting channels and at a temperature of approximately 400oC. Workability testing was carried out using collar type compression specimens by upsetting the specimens between flat platens till the onset of cracking. Workability diagrams have been plotted as a function of axial and hoop strains at failure. The results show that processing by ECAP lead to only minor reductions in workability of CP Ti. The tensile strength is enhanced considerably by this process.

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