In Situ Analysis of the Phase Transformation Kinetics in the β-Water-Quenched Ti-5Al-5Mo-5V-3Cr-1Zr Alloy during Ageing after Fast Heating

Rafael Paiotti Marcondes Guimaraes, Bruna Callegari, Fernando Gustavo Warchomicka, Katherine Aristizabal, Flavio Soldera, Frank Mücklich, Haroldo Cavalcanti Pinto

Research output: Contribution to journalArticle

Abstract

Thermal treatments are the main route to achieve improvements in mechanical properties of β-metastable titanium alloys developed for structural applications in automotive and aerospace industries. Therefore, it is of vital importance to determine phase transformation kinetics and mechanisms of nucleation and precipitation during heat treatment of these alloys. In this context, the present paper focuses on the assessment of solid-state transformations in a β-water-quenched Ti-5Al-5Mo-5V-3Cr-1Zr alloy during the early stages of ageing treatment at 500 °C. In situ tracking of transformations was performed using high-energy synchrotron X-ray diffraction. The transformation sequence β + ω → α + α”iso + β is proposed to take place during this stage. Results show that isothermal α” phase precipitates from ω and from spinodal decomposition domains of the β phase, whereas α nucleates from ω, β and also from α” with different morphologies. Isothermal α” is considered to be the regulator of transformation kinetics. Hardness measurements confirm the presence of ω, although this phase was not detected by X-ray diffraction during the in situ treatment.
Original languageEnglish
Article number12
Pages (from-to)1-16
Number of pages16
JournalQuantum Beam Science
Volume4
Issue number1
DOIs
Publication statusPublished - 21 Feb 2020

Keywords

  • high-energy X-ray diffraction
  • near-beta titanium alloys
  • ageing
  • Rietveld refinement
  • metastable phases

Fields of Expertise

  • Advanced Materials Science
  • Mobility & Production

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