Abstract
To date, ECAP technique have been successfully employed to produce Ultra-fine/Nanostructure grain materials, but some materials such as hexagonal closed-packed (HCP) alloys are difficult to process by ECAP at room temperature. In this work, Transmission Electron Microscopy (TEM), Vickers hardness test and Torsion test were employed to confirm the attainment of ultrafine/nanostructured grain (UFG/NSG) commercial pure titanium (CP-Ti) Titanium fabricated by ECAP as a sever plastic deformation process. The samples were pressed by ECAP (route BC) up to four passes at elevated temperature (400° C). Finally, the Erosion-Corrosion (E-C) behavior of ultrafine/nanostructured grain (UFG/NSG) Titanium in a simulated body fluid were investigated through weight loss measurement.
Highlights
During the last two decades of the twentieth century, titanium and titanium alloys gained much attractiveness and acceptance in engineering and medical applications due to exceptional strength, lower elastic modulus, and greater compatibility with human tissues
It has been demonstrated that the grain refinement during Equal channel angular pressing (ECAP) in route BC, starts with grain elongation occurring in the initial passes, followed by gradual grain fragmentation
Set of experiments was conducted to examine the effect of ECAP passes on the mechanical property and strain homogeny of commercial pure titanium (CP-Ti)
Summary
During the last two decades of the twentieth century, titanium and titanium alloys gained much attractiveness and acceptance in engineering and medical applications due to exceptional strength, lower elastic modulus, and greater compatibility with human tissues. Nevile and McDougal [1] used impinging jet apparatus to study the erosion–corrosion of grade 2 titanium at 18 and 50o C They have shown that under erosion–corrosion conditions the material exhibit active corrosion behavior, in contrast to passive behavior under corrosion. Bermudez et al studied Erosion–corrosion of stainless steels, titanium, tantalum and zirconium under an aqueous solution containing Al2O3 particle and 10wt% HCl. For Ti it was shown that, eroded protected surface shown no sign of corrosion due to passive oxide layer. The erosion–corrosion exposed region showed rough surface with cracks, only on the oxide scale They concluded that the main mechanism is the erosionenhanced corrosion, in which the damage is confined within a thick scale while the base metal remains unaffected [11]. The current work addresses this issue, and compares the E-C resistance of commercial pure titanium CP-Ti with ultrafine/nanostructured grain (UFG/NSG) Titanium fabricated by ECAP as sever plastic deformation process in a simulated body fluid
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