In-situ neutron diffraction study of phase stability and equilibria in the Ti-rich part of the Ti–Al binary system

Shuai Xu*, Mark Reid, Klaus Dieter Liss, Yong Xu, Heng Zhang, Jianping He, Junpin Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Three alloys with composition range of Ti-(25–35)Al (atomic %) were in-situ investigated using neutron diffraction to clarify the phase stability and equilibria in the Ti-rich part of the Ti–Al binary system. The phase transformation sequences of these three alloys were identified based on the neutron diffraction results and differential scanning calorimetry. No superstructure diffraction of β0 has been found in the neutron diffraction patterns. It is concluded that the β0 phase in the examined composition range is thermodynamically unstable. Based on the phase transformation sequences of these three alloys, combining the characters of congruent type relationship and peritectoid type relationship, the phase equilibria among β, α and α2 phases were confirmed as a peritectoid type, with two peritectoid reactions, i.e., β+α→α2 and β +α2→α.

Original languageEnglish
Article number106761
JournalIntermetallics
Volume120
DOIs
StatePublished - May 2020

Keywords

  • In-situ neutron diffraction
  • Order-disorder transformation
  • Phase diagram
  • Phase transformation
  • Titanium aluminides

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