Fabrication of high performance pure titanium material via direct consolidation of TiH2 powder with additions of TiO2

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560099
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Osaka University
• Principal Investigator: UMEDA JUNKO 大阪大学, 接合科学研究所, 助教 (50345162)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: レアメタルフリー / 高強靭性チタン / 酸化チタン

Outline of Final Research Achievements

Mixtures of titanium hydride (TiH2) powders and titanium dioxide (TiO2) particles were employed as starting materials. The mixtures were consolidated by using SPS process and hot extrusion. XRD analysis showed the additive TiO2 particles were thermally decomposed and were completely dissolved into Ti matrix during SPS process at 1073K for 1.8 ks. The lattice constant in c-axis increased proportional to TiO2 contents, while no remarkable changes were detected in the a-axis. Tensile testing showed that UTS and 0.2%YS increased in proportion to TiO2 content, but elongation decreased slightly with increased TiO2 content. In particular, extruded TiH2 powder material with 1.5 wt.% TiO2 particles produced 1158 MPa UTS, 946 MPa 0.2%YS and 24% elongation. Comparison to pure Ti with no additive TiO2 particle, extruded TiH2 powder material showed the decrease of ductility while improving tensile strength. These results were showed to be superior to those of the conventional Ti-6Al-4V alloy.

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