抄録
The purpose of this study is to develop TiC dispersed Ti-6Al-4V alloy composites with useful mechanical properties by using reaction sintered fine TiC dispersion technique in the powder metallurgy method and the hydrbgenation treatment due to grain refinement of matrix material. Mo_2C and Ti-6Al-4V prealloyed powder were mechanically blended in a high energy ball mill. The mixed powder was pressed into dies and consolidated by reaction sintering following HIP treatment. The dispersed particles Mo_2C produced reactive TiC in the matrix during sintering. In grain refilling treatments, hydrogenation, hot roll forming and heat treatment to occur fine dispersed Ti hydride precipitation, and dehydrogenation process were introduced. As a results of this fabrication process to be controlled grain refinement, 1) the microstructure of dehydrogenated specimen indicates very fine grain size than 1 μm in diameter. Then, the reacted particles TiC are more shortened by hot roll forming after hydrogenation. 2) In Ti-6Al-4V alloy composites with 3vol% Mo_2C, Tensile strength and elongation at room temperature is increased in comparison with that of non hydrogenation.
