TY - JOUR
T1 - Cold consolidation of ball-milled titanium powders using high-pressure torsion
AU - Edalati, Kaveh
AU - Horita, Zenji
AU - Fujiwara, Hiroshi
AU - Ameyama, Kei
N1 - Funding Information:
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).
PY - 2010/12
Y1 - 2010/12
N2 - 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.
AB - 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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U2 - 10.1007/s11661-010-0400-6
DO - 10.1007/s11661-010-0400-6
M3 - Article
AN - SCOPUS:78049429845
SN - 1073-5623
VL - 41
SP - 3308
EP - 3317
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 13
ER -