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

Journal Article


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.

Publication Date


  • 2019

Citation


  • Naseri, R., Mitchell, D. R. G., Savvakin, D. G., Nancarrow, M. J. B., Furuhara, T., Saleh, A. A., Gazder, A. A. & Pereloma, E. V. (2019). The effect of β-phase condition on the tensile behaviour in a near-β Ti alloy produced by blended elemental powder metallurgy. Journal of Materials Science and Engineering A, 747 232-243.

Scopus Eid


  • 2-s2.0-85060567811

Number Of Pages


  • 11

Start Page


  • 232

End Page


  • 243

Volume


  • 747

Place Of Publication


  • United States

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.

Publication Date


  • 2019

Citation


  • Naseri, R., Mitchell, D. R. G., Savvakin, D. G., Nancarrow, M. J. B., Furuhara, T., Saleh, A. A., Gazder, A. A. & Pereloma, E. V. (2019). The effect of β-phase condition on the tensile behaviour in a near-β Ti alloy produced by blended elemental powder metallurgy. Journal of Materials Science and Engineering A, 747 232-243.

Scopus Eid


  • 2-s2.0-85060567811

Number Of Pages


  • 11

Start Page


  • 232

End Page


  • 243

Volume


  • 747

Place Of Publication


  • United States