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

Jun Zhang and Dong Li1) Shenyang University, Shenyang 110044, China2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China (Received 2001-11-14)

摘 要：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 αp whereas the α2 ordered phase precipitated only at the lamella boundaries and dislocations in p,. Aging at a moderate temperature can promote the tendency of uniform precipitation of α2 phase in both αp and p,. Aging at a relatively low temperature is suitable for the uniform precipitation and growth of fine α2 particles throughout both the αp and βt matrix.

关键词：