Precipitation of ordered α₂ phase in a near-α titanium alloy with duplex microstructure

The precipitation of ordered α₂ phase in a near-α Ti-6.3 Al-4.8Sn-2.0Zr-1.0Mo-0.34Si-0.9Nd (mass fraction) alloy with duplex microstructure, during aging at various temperatures, was investigated. It is concluded that the precipitation and growth of the α₂ phase can be controlled by suitable selection of the aging temperature. Aging at higher temperatures can result in the uniform precipitation and growth of α₂ ordered phase in α_p whereas the α₂ ordered phase precipitated only at the lamella boundaries and dislocations in β_t. Aging at a moderate temperature can promote the tendency of uniform precipitation of α₂ phase in both α_p and β₁. Aging at a relatively low temperature is suitable for the uniform precipitation and growth of fine α₂ particles throughout both the α_p and β₁, matrix.