Abstract
Pure Ti (99.5 pct) powders after processing with ball milling (BM) were consolidated to disc-shaped samples with 10-mm diameter and 0.8-mm thickness at room temperature using high-pressure torsion (HPT). A relative density as high as 99.9 pct, high bending and tensile strengths of 2.55 to 3.45 and 1.35 GPa, respectively, and a moderate ductility of 8 pct with an ultrafine grained structure are achieved after cold consolidation with HPT, which exceed those of hot consolidation methods. X-ray diffraction (XRD) analysis showed that a phase transformation occurs from α phase to ω phase during HPT under a pressure of 6 GPa as in bulk pure Ti, whereas no phase transformation is detected after processing with BM alone. It was confirmed that the strength and ductility are improved by a combined application of BM and HPT when compared with other severe plastic deformation methods applied to Ti and Ti-6 pct Al-4 pct V, so that no alloying elements are required for the achievement of a comparable strength and ductility.
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Acknowledgments
We thank Professor Kenji Higashida, Kyushu University, for permitting the use of the bending test facility, and Dr. Masaki Tanaka, Kyushu University, for helpful assistance in using a bending test machine. We are also grateful to Professor H. Miura, Kyushu University, for lending us a facility of the density measurement. One of the authors (KE) thanks the Islamic Development Bank for a scholarship. This work was supported, in part, by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan in the Priority Area “Giant Straining Process for Advanced Materials Containing Ultra-High Density Lattice Defects” and, in part, by Kyushu University Interdisciplinary Programs in Education and Projects in Research Development (P&P).
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Manuscript submitted December 17, 2009.
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Edalati, K., Horita, Z., Fujiwara, H. et al. Cold Consolidation of Ball-Milled Titanium Powders Using High-Pressure Torsion. Metall Mater Trans A 41, 3308–3317 (2010). https://doi.org/10.1007/s11661-010-0400-6
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DOI: https://doi.org/10.1007/s11661-010-0400-6