S0401-1-1 酸化物分散および微細組織化によるチタン粉末固化材の強度特性(粉末成形とその評価(1))

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Titanium (Ti) alloys are applied for various fields such as aircraft and automotive industries due to their high specific strength. Ti-6Al-4V (Ti64) is the most general Ti alloy, and shows superior mechanical properties i.e. 900MPa to 1200MPa of tensile strength. However, its application is limited because of a poor ductility and the expensive initial cost. In this study, Roll-Compaction (RCP) process is applied to pure Ti powder to solve the above problems. Pure sponge Ti powders were employed as input materials. RCP was effective for the grain refinement and the in-situ formation of titanium oxide (TiO_2) dispersions of the matrix to improve the mechanical response in using pure titanium. RCPed powder was consolidated by using spark plasma sintering (SPS) equipment to serve a high density billet. Subsequently, hot extrusion process was applied to the billet to prepare a full density rod specimen. The evaluation of mechanical properties at room temperature showed high tensile strength of 640MPa and good elongation of 17%. Moreover, the refining process and heat treatment of RCPed powders before SPS showed extremely high tensile strength of 935MPa.
2009-09-12