Phase Transformation Kinetics of High Nb-TiAl Alloy during Continuous Heating

Author:

Li Ying,Zhou Lian,Lin Junpin,Chang Hui,Fan Jianglei,Cao Yang,Wang Yan,Wang Yongbiao,Liu Jianxiu

Abstract

Abstract In this work, the phase transformation behavior of Ti-45Al-8.5Nb-(W, B, Y) alloy during continuous heating was investigated using dilatometer and optical microscopy. Results indicated that the phase transformation process of high Nb-TiAl alloy during continuous heating included two stages: ordered α2 → disorder α and tetragonal γ → hexagonal α. According to the microstructure analysis, the initial α2/γ lamellar structure transformed into the massive γ phase and α phase (retained as α2) during the heating process. The activation energy of α2 → α and γ → α was 989.65 kJ/mol and 995.30 kJ/mol, respectively. Moreover, the lower the heating rate was, the faster the phase transformation reached the equilibrium state.

Publisher

IOP Publishing

Subject

General Physics and Astronomy

Reference25 articles.

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