Strengthening mechanism of pure titanium via powder metallurgy hot extruded process

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06503
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Osaka University
• Principal Investigator: UMEDA JUNKO 大阪大学, 接合科学研究所, 准教授 (50345162)
• Project Period (FY): 2015-10-21 – 2018-03-31
• Keywords: 水素化チタン / 純チタン / 集合組識 / 固溶強化

Outline of Final Research Achievements

Hydrogen containing titanium (TiH2) powder were employed via spark plasma sintering and hot extrusion process in solid-state. TiH2 material was effective for a significant improvement of 0.2% yield strength and ultimate tensile strength. The formation of <0001> α / <10 - 10> α texture of the extruded TiH2 material in the β to α phase transformation was fabricated during the cooling process. The phase transformation contributed to enhance the mechanical strength of hydrogen containing Ti materials. Based on these results, we focused on iron which is an impurity component of commercial titanium, also a β phase stabilizing element. Iron containing pure titanium material was also showed high strength by formation of <0001> α texture by hot plastic working with phase transformation as well as hydrogen containing. The materials design for the texture control and high strength powder metallurgy pure titanium materials containing β phase stabilizing element was established.

Free Research Field

粉末冶金