Synthesis of titanium orthorhombic alloy using binder jetting additive manufacturing

Abstract

Abstract The presented work demonstrates the capability of producing Ti-22Al-25Nb parts from Ti, Al, Nb elemental powders using Binder Jetting (BJ) additive manufacturing (AM) method followed by high-temperature reactive sintering and subsequent annealing. The microstructural investigation and phase analysis demonstrate that reactive sintering at 800\u202f°C and 1000\u202f°C results in diffusion of Al into Ti particles forming Ti-Al solid solution and Ti3Al-phase, while sintering at 1100\u202f°C allows Nb diffusion into Ti particles. Microstructural analysis showed that the reactive sintering temperature affects the surface morphology of particles due to different wettability of liquid Al. Annealing at 1400\u202f°C resulted in the formation of B2/β-phase with acicular Ti2AlNb precipitates. The results demonstrate that the used approach can be successfully utilized for the production of Ti-22Al-25Nb parts.