Abstract
Using three different kinds of mixed powder compacts; each composed of Ti+TiAl3+(Al-50V), Ti+ A1+(Al-50V) and Ti+TiAl3+V, the sintering behavior of Ti-6A1-4V ternary system was investigated mainly through dilatometric method and EPMA, in relation to an α2 phase.
The results obtained are summarized as follows:
(1) The α2 phase was observed to have widely developed in all of the above mentioned three specimens; at 1373 K during heating process.
(2) This α2 phase has disappeared by the diffusional process in both Ti + TiAl3 + (Al-50V) and Ti + Al + (Al-50V) specimens after sintering at 1373 K for 3.6 ks, however in the Ti +TiAl3+V specimen, small amount of remaining α2 phase was observed.
(3) The sintering conditions necessary to obtain homogenized structure were confirmed to be 1373 K×3.6 ks, 1473 K×3.6 ks and 1573 K×3.6 ks in the following order: Ti+TiAl3+(Al-50V), Ti+AI+(Al-50V) and Ti+TiAl3+V specimens.
