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-6.3A1-4.8Sn-2.0Zr-1.0Mo-0.34Si-0.9Nd (mass fraction) alloy with duplexmicrostructure, during aging at various temperatures, was investigated. It is concluded that the precipitation and growth of the α2 phasecan be controlled by suitable selection of the aging temperature. Aging at higher temperatures can result in the uniform precipitation andgrowth of α2 ordered phase in αp whereas the α2 ordered phase precipitated only at the lamella boundaries and dislocations in βt. Aging ata moderate temperature can promote the tendency of uniform precipitation of α2 phase in both αp and βt-Aging at a relatively low tem-perature is suitable for the uniform precipitation and growth of fine α2 particles throughout both the αp and βt matrix.