Phase transformation and equation of state in Ti–45Al alloy under high pressure

Xi Li, Ruixiang Zhu, Jinghua Xin, Minsi Luo, Shun Li Shang, Zi Kui Liu, Chongshan Yin, Ken Ichi Funakoshi, Rian Johannes Dippenaar, Yuji Higo, Ayumi Shiro, Mark Reid, Takahisa Shobu, Koichi Akita, Wei Bing Zhang, Klaus Dieter Liss

Research output: Contribution to journalArticlepeer-review


The phase transformations and pressure-volume dependencies of the Ti–45Al alloy with respect to pressure have been investigated by means of in-situ observation using multi anvil-type high-pressure devices and synchrotron radiation. Under hydrostatic compression from 0 to 10.1 GPa, about 2.3 vol % of γ transforms continuously to α2. Lattice parameters as well as volume fractions of these two phases have been determined as functions of pressure. Bulk moduli estimated using Birch-Murnaghan's equation of state are 146.2 GPa for the γ phase, 136.7 GPa for the α2 phase, and 145.6 GPa for their two-phase mixture of Ti–45Al alloy. First-principles have also applied to investigate bulk moduli of two single phases, and the deviation between calculations and measurements is discussed and attributed to mainly phase transformation. The present study provides useful insights into thermodynamics of α2 and γ phases under high pressure.

Original languageEnglish (US)
Article number102641
JournalCalphad: Computer Coupling of Phase Diagrams and Thermochemistry
StatePublished - Mar 2024

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Computer Science Applications

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