The effect of β-phase condition on the tensile behaviour in a near-β Ti alloy produced by blended elemental powder metallurgy
RIS ID
133062
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 Details
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.