Ultrafine grained titanium sheets with high strength and high corrosion resistance

► UFG microstructure was produced in Ti by differential speed rolling. ► The processed Ti exhibited high strength as well as high corrosion resistance. ► The pure Ti with the smallest grain size revealed the lowest corrosion rate. ► The corrosion rate decreased with decrease in grain size. The pure...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-11, Vol.528 (29), p.8479-8485
Main Authors: Kim, Hye Sung, Yoo, Seong Jin, Ahn, Jin Woo, Kim, Doo Hyun, Kim, Woo Jin
Format: Article
Language:English
Subjects:
Applied sciences
Bulk deformation
Corrosion
Corrosion prevention
Corrosion rate
Corrosion resistance
Elasticity. Plasticity
Exact sciences and technology
Grain refinement
Grain size
High strength
High-ratio differential speed rolling
Mechanical characterization
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Orientation relationships
Rolls
Strengthening
Titanium
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Summary:► UFG microstructure was produced in Ti by differential speed rolling. ► The processed Ti exhibited high strength as well as high corrosion resistance. ► The pure Ti with the smallest grain size revealed the lowest corrosion rate. ► The corrosion rate decreased with decrease in grain size. The pure titanium sheets with ultrafine grained (UFG) microstructures were produced by high-ratio differential speed rolling (HRDSR) at different roll speed ratios and different roll temperatures. Significant strengthening was achieved after HRDSR and the sample processed at a higher speed ratio or a lower processing temperature yielded a higher strength. The strengthening mechanism in the HRDSR processed Ti was examined in terms of the models based on the critical stress for activating the Frank–Read source and the grain-size strengthening. The UFG Ti exhibited high corrosion resistance in H 2SO 4 and HCl solutions. The corrosion rate decreased linearly with the inverse square root of the grain size. The Ti with the smallest grain size, which was HRDSR processed at room temperature, revealed the best combination of high strength and high corrosion rate.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2011.07.074