In situ assessment of isochronal phase transformations in a lamellar Ti–5Al–5Mo–5V–3Cr–1Zr alloy using synchrotron X-ray diffraction

B. Callegari, L. Campo, K. Aristizabal, M. A. Guitar, F. Warchomicka, R. S. Coelho, P. P. Brito, F. A. Soldera, F. Mücklich, H. C. Pinto*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Phase transformations in a lamellar Ti–5Al–5Mo–5V–3Cr–1Zr (Ti-55531) alloy upon heating at continuous rates of 5, 20 and 100 °C/min has been studied by in situ high energy X-ray diffraction (HEXRD), aided by scanning and transmission electron microscopy, atom probe tomography and hardness measurements. During slow heating, the β phase has shown a behavior suggestive of additional transformations other than the continuous α → β decomposition observed at higher heating rates. Such behavior has been attributed to the precipitation of an embryonic isothermal ω phase. APT analyses have shown that no elemental partitioning occurs between the β matrix and the lamellar α phase, but it does between β and grain boundary α, suggesting that ω phase precipitates with solute rejection in regions outside lamellar colonies embedded in an enriched matrix. Above 500 °C, diffusion becomes significantly enhanced and α decomposition takes place.

Original languageEnglish
Article number157105
JournalJournal of Alloys and Compounds
Publication statusPublished - 5 Feb 2021


  • Atom probe tomography
  • Element partitioning
  • High energy X-ray diffraction
  • Phase transformations
  • Titanium alloys

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fields of Expertise

  • Advanced Materials Science

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