反応焼結によるTiB分散チタン合金複合材の製作と機械的性質

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Fine TiB dispersed Ti-6Al-4V alloy composites, which expect high hardness, high strength, high wear resistance and superplasticity, were developed using a powder metallurgy method. Boride powder and Ti-6Al-4V prealloyed powder were mechanically blended in a high energy ball mill. The powder obtained was pressed into dies and consolidated by reaction sintering. The dispersed boride particles produced reactive TiB in the matrix during sintering. In following hot isostatic press (HIP), samples showed a very fine microstructure of TiB dispersing homogeneously. At room temperature, hardness, compressive strength and wear resistance had the tendency to increase as blended boride content increases. Especially, the composite obtained by blending MoB powder showed small size needle-like TiB dispersion and fine near β phase matrix, and in blending MoB of 15 vol% showed a good wear resistance. In compressive and tensile test at 1173K, the TiB dispersed composite exhibits m values of no less than 0.38 and large elongation, and resultantly superplasticity was confirmed.
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