Abstract
We report the dimensional change of powder mixture of titanium and aluminum alloy during reactive sintering in hot isostatic pressing(HIP) . The powder mixture of titanium and aluminum alloy were prepared by using powder extrusion process with various extrusion ratio. The hot pressed material showed a swelling during reactive sintering because of the pore formation. The materials with extrusion ratio over 5.4 exhibited a volumetric shrinking at the ratio of 0.96. However, these materials exhibited anisotropic dimensional change. The materials that had a extrusion ratio from 17.6 to 295 showed the expansion at the ratio of 1.1 for longitudinal direction of extruded direction and the shrinkage at the ratio of 0.93 for radial direction of extruded direction. This anisotropy is due to the fibrous structure developed by extrusion.
