Solidification sequence and phase equilibria in Ti-47Al-22Nb and Ti-47Al-20Nb ternary alloys

Xiangjun Xu, Shuai Xu*, Simbarashe Fashu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The phase transformation sequences and phase equilibria in Ti-47Al-20Nb and Ti-47Al-22Nb (at.%) alloys were investigated through experiments and computational (CALculation of PHAse Diagrams) techniques. Experiments to study nonequilibria phase transformations involved quenching the alloys from high temperature followed by composition and microstructure characterization. The computed results show that with increase in temperature, the α + β + γ tie-triangle phase region shifts towards low Nb content. On the contrary, experimental results show that with increase in temperature the tie-triangle of α + β + γ moves towards high Nb content. These changes are attributed to the expansion of the α phase region and corresponding changes of the primary α, β and γ phase regions with increase in temperature. In the experimentally studied alloys, a part of the α phase transformed to γ phase by massive transformation and most of the β phase transformed to γ phase in high Nb content alloys.

Original languageEnglish
Article number086514
JournalMaterials Research Express
Volume7
Issue number8
DOIs
StatePublished - Aug 2020

Keywords

  • TiAl alloys
  • microstructure
  • phase stability
  • phase transformation
  • solidification

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