Seeded growth of Ti-46Al-8Nb polysynthetically twinned crystals with an ultra-high elongation

Hao Jin^a^,^b, Qing Jia^a, Quangang Xian^a, Ronghua Liu^a, Yuyou Cui^a, Dongsheng Xu^a, Rui Yang^a^,^*(

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Fig. 7.. Schematic process of a new mechanism on seeding procedure showing (a) nucleation and growth of β phase and peritectic α phase nucleating directly from the melt; (b) β/α transformation in heterogeneous nucleation model, (c) lamellar structure after the whole process; (d) appearance of β secondary dendrites and (e) β/α transformation in homogeneous nucleation model and (f) formation of the columnar B2 phase parallel to the growth direction.