Metallic phase stabilization is a matter of thermodynamic balance involving the free energy state of metal. The thermodynamics of a particular system is commonly summarized in an equilibrium phase diagram. Many binary phase diagrams are available and it is sometimes possible to use these as bases for conjecture about more complex systems. Miscible, binary combinations based on titanium tend to be of two types: alpha stabilizing or beta stabilizing. In the ti-6al-4v alloy, al is the alpha stabilizer and it tends to reside selectively in beta-phase parts of the structure. Hence, certain features of structure containing hypernormal concentrations of al or V sometimes are identified as aluminum-stabilized alpha segregation or vanadium-stabilized beta segregation. When unusual amounts of oxygen or nitrogen can be associated with an alpha- stabilized irregularity, it is commonly identified as interstitial- stabilized segregation, but valid questions exist about the role of the gaseous contaminants when their presence in unusual concentrations is neither detected nor suspected.
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