Primary Phase Selection Related to Liquid Local Structure Within Ti–Al–V Alloy Solidified During Free Fall

Alloying Elements in Intermetallic γ‐TiAl Based Alloys – A Review on Their Influence on Phase Equilibria and Phase Transformations

“…[34] Assessments of the Ti-Al-V system by different authors have shown that no ternary intermetallic phases exist regardless of the temperature, [201,202] which is different from other ternary systems containing β-stabilizing elements, such as Nb, Ta and Mn. Concerning solidification, Zhai et al [203] reported that the primary solidifying phase changes from β to α for a Ti-45Al-4 V (at%) alloy upon rapid solidification during free fall in drop tube experiments under an estimated cooling rate of 10 3 to 10 5 K s À1 . However, by increasing the V content of the material, the β phase could be retained even for such high cooling rates.…”

“…However, by increasing the V content of the material, the β phase could be retained even for such high cooling rates. [203] Another consequence of an increasing V content with respect to the solid-solid phase transformations was the suppression of the massive α ! γ transformation in favor of the α !…”

“…However, by increasing the V content of the material, the β phase could be retained even for such high cooling rates. [ 203 ] Another consequence of an increasing V content with respect to the solid‐solid phase transformations was the suppression of the massive α → γ transformation in favor of the α → α 2 transformation, which is preferred for Al‐leaner alloys. [ 204 ] Zhai et al [ 204 ] argued that this can be attributed to the strong similarities between Ti and V, which are horizontal neighbors in the periodic table, thus making the alloy effectively Al‐lean upon alloying with V. Furthermore, as mentioned in Section 2.2.1, this element is able to promote the martensitic β → α transformation over the massive one upon quenching from high temperatures, if a sufficient amount of this element is present.…”