| In this study powder metallurgy method was used to fabricate the TiB reinforced Ti alloy composite materials, and the matrix Ti alloy composition was basically Ti-5Al-2.5Fe. Especially the reinforcing particle TiB was obtained from TiB₂ particles by the internal reaction during sintering process. Sintering at 1300℃ in argon atmosphere, no TiB formation was observed with any addition of TiB₂. And at 1250℃ in vacuum, TiB formation wasn`t also observed. At 1300℃ in vacuum, however, TiB formation was observed for the specimens added 2∼9wt% TiB₂. The TiB particles formed have a shape of acicular structure, and have a size of 10∼30 ㎛. Microhardness test showed that specimens with TiB particles have much higher hardness value than that of unreinforced alloy. Therefore internal reaction process, which also has an advantage of a near-net-shape technology, can be said to be a potential method to produce high strength Ti alloy composites using low-cost additive elements. |
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