Abstract
AbstractThe interface phase in the rJ.2and B2 boundaries after post-forging heat treatment in a Ti–25Al–10Nb–3V–1Mo (Super α2) alloy has been studied. It has been found that the interface phases in Super α2 are more likely to be formed after solution and aging heat treatment than after solution treatment only, or an aging heat treatment only. This interface phase has been identified as orthorhombic with lattice parameters of a = 0·54 nm, b = 0·88 nm, and c = 0·94 nm, andforms directly from the metastable B2 phase at the interface area. This interface orthorhombic phase results in the poor mechanical properties of this alloy, particularly the room temperature ductility. It is suggested that direct aging after forging is beneficial and that solution plus aging heat treatment should be used carefully.MST/2003
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