What is titanium's structure like?
There are two possible shapes for the internal structure of the titanium metal, alpha (called alpha phase) where the atoms are positioned in a hexagonal close-packed form, and beta phase, where the atoms are positioned in a body-centered cubic form. Titanium in beta phase is slightly denser than in alpha phase.
Pure titanium exists in form of α-phase at temperatures up to1621°F (883°C) and in form of β-phase at temperatures above 1621°F (883°C). The temperature of 1621°F (883°C) – is called Beta Transus Temperature – temperature of transition to the β-phase. Pure titanium is stable in α-phase until this temperature, where it transforms in β-phase. The beta phase is stable from 1621°F (883°C) to the melting point 3034°F (1668°C).