The purpose of this study is to develop the fine TiB dispersion strengthened Ti-6Al-4V alloy composites, using powder metallurgy method, which show the superplasticity. The dispersed boride particles, i.e. TiB2, FeB and MoB, make up the reactive particle TiB in Ti-6Al-4V alloy matrix during sintering process. As a result, fine microstructure is shown, which is one of necessary conditions due to the development of superplasticity, the enhancement of strength and wear resistance can be expected. Boride powder (TiB2, FeB and MoB) and Ti-6Al-4V prealloy powder were mechanically alloyed by high energy ball milling. The obtained powders were pressed into dies, consolidated by reaction sintering and then hot isostatic pressing(HIP). The HIPed samples showed a very fine microstructure dispersing TiB uniformly. At room temperature, hardness and compressive strength had the tendency to increase with increasing boride content. 10 similar to 15vol% MoB dispersed alloy exhibited good mechanical properties from the point of view of the ductility and wear resistance comparing with that of other boride dispersed alloy. The result of compression test at 1173K, 1x10(-5) Torr in vacuum and 6x10(-3)similar to 1x10(-4) g(-1) on strain rate showed that 5 similar to 20vol% TiB2, FeB and MoB dispersed alloy exhibited a strain rate sensitivity exponent, m, of no less than 0.4, indicating the development of superplasticity.
