S. Fukumoto et al., TRANSIENT LIQUID-PHASE BONDING PROCESS IN SIC FIBER-REINFORCED TI-6AL-4V COMPOSITES, ISIJ international, 35(10), 1995, pp. 1307-1314
Continuous SiC fiber reinforced Ti-6Al-4V composites were joined to a
Ti-6Al-4V plate by transient liquid phase (TLP) bonding process using
Ti-Cu-Zr filler metal. Three processes, which were the dissolution of
base metal, the isothermal solidification and the homogenization proce
sses, were observed. The saturated dissolution width increased as the
fiber volume fraction increased. Namely, the dissolution width was inv
ersely proportional to the fiber volume fraction. Although the time fo
r completion of the dissolution of base metal and the isothermal solid
ification would be long with increasing fiber volume fraction, these t
wo processes could be completed for a short time and so marked differe
nce could not be observed. Homogenization process is important to obta
in high strength joint. It was cleared that the process could approxim
ate to one dimensional diffusion model. Since the filler metal was mel
ted during the bonding process, the liquid phase reacted with the SiC
fiber. As a result, the brittle products such as TiC, ZrC and Ti5Si3 w
ere formed at the interface between the fibers and the filler metal. H
owever, these products did not affect the joint strength because they
were formed only at the end of fibers in very small amounts.