The effect of β-phase condition on the tensile behaviour in a near-β Ti alloy produced by blended elemental powder metallurgy

R. Naseri, D. R.G. Mitchell, D. G. Savvakin, M. J.B. Nancarrow, T. Furuhara, A. A. Saleh, A. A. Gazder, E. V. Pereloma

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this study, a Ti-10V-3Fe-3Al alloy produced by the blended elemental powder metallurgy technique was subjected to two heat treatments at 675℃ and 625℃, resulting in lower β-phase stability and larger β-domain size in the sample heat treated at the higher temperature. The microstructural response to uniaxial tensile loading for the two conditions was investigated using a combination of optical microscopy, electron back-scattering diffraction and transmission electron microscopy. The observations indicate that a majority of deformation-induced products are formed in the vicinity of the fracture surface due to stress tri-axiality. Within this region, the 675℃ sample accommodated deformation via dominant {332}〈113〉 twinning, α″ martensite formation and limited {112}〈111〉 twinning. On the other hand, the sample with higher β-phase stability accommodated deformation via α″ martensite formation and perfect slip with reduced twinning activity. The formation of deformation-induced ωD phase between the β matrix and α″ martensite laths was also observed in the sample with lower β-phase stability. Reduction of the interfacial energy by stress relaxation is assumed to be the driving force for ωD formation.

Original languageEnglish
Pages (from-to)232-243
Number of pages12
JournalMaterials Science and Engineering A
Volume747
DOIs
Publication statusPublished - 2019 Feb 18

Keywords

  • Deformation-induced phase transformation
  • Electron back-scattering diffraction (EBSD)
  • Near-β titanium
  • Scanning transmission electron microscopy (STEM)
  • Twinning

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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