FEATURES　OF　ANNEALING　MICROSTRUCTURE　AND　TEXTURE　IN　Ti－25Al－10Nb－3V－1Mo　SHEET

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Some features of microstructure and texture development during annealing in Ti-25Al-10Nb3V-1 Mo sheet, in which the microstructure was composed of hexagonal α2 phase and βphase were investigated. The result shows that texture of α2 phase is mainly { 1124 } <1121>, and β phase is { 1 11 } < uvw> before and after annealing. The structures transformed into stable state by annealing, i. e. βphase transformed into α2 phase at temperature 850℃ or 950℃ ,or α2 phase transfornied into β phase at temperature 1 050℃.Meanwhile, α2 phase took shape of equal-axial structure. During annealing, recrystallization was almost not found and so recovery was the principal procedure. α2 phase was tendentiously distributed around grain boundary of β phase in which a higher boundary energy should exist.