In-situ synchrotron radiation study of the aging response of Ti-6Al-4V alloy with different starting microstructures

B. Callegari, João Pedro Oliveira, K. Aristizabal, R. S. Coelho, P. P. Brito, L. Wu, N. Schell, F. A. Soldera, F. Mücklich, H. C. Pinto

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3 Citations (Scopus)

Abstract

The aging behavior of a Ti-6Al-4V alloy with different starting microstructures was evaluated by means of synchrotron X-ray diffraction, scanning-transmission electron microscopy and micro-hardness measurements. Initial microstructures were produced by thermal and thermomechanical treatments and comprised different morphologies of α phase (martensitic, lamellar, bimodal and globular), as well as the presence or absence of the β phase. Results show that one or more of the following phenomena can take place during aging and contribute to the hardening of the alloy: β decomposition into fine secondary α laths; transformation of the metastable martensitic α′ into the equilibrium α phase; and precipitation of the intermetallic Ti3Al. The composition and distribution of the β phase was shown to affect the precipitation of secondary α during aging, while the composition of the α phase plays a key role on the formation of Ti3Al. In situ X-ray diffraction studies of the early stages of aging show the kinetics of the α′ → α conversion by the reduction in FWHM of XRD reflections, indicate the contribution to hardening by the increase of the c/a ratio and the consequent limitation of active slip systems and depict the chemical homogenization and decomposition of the β phase.

Original languageEnglish
Article number110400
JournalMaterials Characterization
Volume165
DOIs
Publication statusPublished - Jul 2020

Keywords

  • Aging
  • Hardening
  • Phase transformation
  • Secondary precipitation
  • Synchrotron X-ray diffraction
  • Titanium alloys

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