How do alpha-stabilizing and beta-stabilizing elements affect titanium alloys?

In pure titanium, the metal exists in a hexagonal close-packed alpha ($\alpha$) phase at lower temperatures and transforms into a body-centred cubic beta ($\beta$) phase when heated above 883 °C. Alloying elements are added to titanium to modify these phase transitions, effectively stabilizing one phase over the other across different temperature ranges.12

• Alpha-stabilizing elements: Elements such as aluminum and oxygen stabilize the alpha phase, extending its existence to higher temperatures. Aluminum is particularly significant as it acts as a strengthener that can be added in concentrations up to 8 percent by weight without reducing the metal's ductility.1
• Beta-stabilizing elements: Elements such as vanadium, iron, molybdenum, nickel, palladium, niobium, silicon, and chromium stabilize the beta phase, allowing it to persist at lower temperatures.1

The interaction between these elements determines the alloy's microstructure and properties. By controlling the concentration of these stabilizers, manufacturers can produce different classes of titanium alloys—alpha, beta, or alpha-beta—to achieve specific combinations of strength, toughness, and formability required for various industrial and aerospace applications.1