EBSD Analysis of Grain-Refinement Mechanisms Operating During Equal-Channel Angular Pressing of Commercial-Purity Titanium

2019 ◽  
Author(s):  
G.S. Dyakonov ◽  
S. Mironov ◽  
I.P. Semenova ◽  
R.Z. Valiev ◽  
S.L. Semiatin
Keyword(s):  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Ebsd Analysis ◽  
Commercial Purity ◽  
Angular Pressing ◽  
Commercial Purity Titanium ◽  
Purity Titanium

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.

Grain Refinement in Commercial Purity Titanium Sheets by Constrained Groove Pressing

2011 ◽  
Vol 683 ◽  
pp. 233-242 ◽  
Author(s):  
G.V. Preetham Kumar ◽  
Ganesh G. Niranjan ◽  
Chakkingal Uday
Keyword(s):  
Plastic Deformation ◽  
Grain Refinement ◽  
Commercial Purity ◽  
Shear Deformations ◽  
Annealed Condition ◽  
Working Temperature ◽  
Warm Working ◽  
Commercial Purity Titanium ◽  
Significant Interest ◽  
Purity Titanium

Grain refinement studies in titanium have gained significant interest owing to its importance as a biomaterial. Severe plastic deformation techniques have been widely applied for grain refinement in metals and are capable of producing ultra fine and nano sized microstructures. In this study, repetitive shear deformations by constrained groove pressing have been applied to commercial purity titanium sheets of 2 mm thickness at a warm working temperature of 300oC. Microstructure studies reveal the formation of elongated grains with widths of the order of 0.5μm from an initial grain size of 40μm in the annealed condition. An increase in strength is also observed.

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