EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

The microstructure of Ti-based polycrystalline alloys with iron, cobalt, nickel and cromium as well as Zr-Nb alloys has been studied in the temperature and concentration interval where two phases, namely, hexagonal α-Ti or α-Zr and cubic β-Ti or β-Zr are in equilibrium. The α-Ti or α-Zr phase forms either continuous or discontinuous layers in the β-Ti/β-Ti or β-Zr/β-Zr grain boundaries (GBs). Continuous layers correspond to the complete wetting of β/β GBs by a second solid phase α. Discontinuous layers correspond to the incomplete (or partial) GB wetting by a second solid phase. The temperature dependences of the portion of completely wetted GBs as well as that of the thickness of continuous GB layer of α phase have been measured. Both values monotonously or non-monotonously increase with increasing temperature.