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The α(α2)/γ phase equilibria in Ti-Al-X(X=C.B,Fe,Si in at. pct) ternary systems were studiedby equilibrium heat-treatment and EPMA. The results show that the addition of B to the Ti-Albinary system leads to a shift of both α(α2)/[α(α2) + γy] and [(α(α2) + γ/γ phase boundariesto Al-rich side and 0.1 B addition decreases Ta by 18℃. The addition of C leads to a shift of[α(α2) + γ/γ phase boundary to Al-rich side but the effct of 0.2 at. pct C additon on Tα isvery slight The addition of Fe results in α(α2)/[α(α2) +γ] and [α(α2) + γ]/γ phase boundariesshifting to Ti-rich side and 1.0 Fe addition increases Tα by 90-110℃. The addition of Si leadsto a shift of α(α2)/[α(α2)/[α(α2) +γ] phase boundary to Ti-rich side and the 0.3 Si additionincreases Ta by 80~110℃. The solubilities for C, B and Si in α(α2) phase are higher than thosein the γ phase but the solubility for Fe in α(α2) phase is lower than that in γ phase.
The results show that the addition of B to the Ti (X = CB, Fe, Si in at. Pct) ternary systems were studied by equilibrium heat-treatment and EPMA. -Albinary system leads to a shift of both α (α2) / [α (α2) + γy] and [(α (α2) + γ / γ phase boundariesto Al- addition of C leads to a shift of [α (α2) + γ / γ phase boundary to Al-rich side but the effct of 0.2 at. pct C additon on Tα isvery slight addition to Fe results in α (α2) / [ α (α2) + γ] and [α (α2) + γ] / γ phase boundariesshifting to Ti-rich side and 1.0 Fe addition increases Tα by 90 to 110 ° C. The addition of Si lead to a shift of α (α2) / The solubilities for C, B and Si in α (α2) phase are higher than (α2) + γ] phase boundary to Ti-rich side and the 0.3 Si addition in- creases Ta by 80-110 ° C. [ thosein the γ phase but the solubility for Fe in α (α2) phase is lower than that in γ phase.