Effect of temperature on the specific energy of beta/alpha interfaces in Ti-6Al-4V alloy

M.A. Murzinova1
1Institute for Metals Superplasticity Problems RAS, 39 Khalturin St., 450001 Ufa
Most of titanium alloys contain two phases at temperatures of processing and exploitation: -phase with HCP lattice and -phase with BCC lattice. Stability of two-phase structure and thermodynamics of / transformation, which occurs in a wide range of temperatures, considerably depend on the specific energy of interphase boundaries, and, consequently, on their structure. Basing on the literature data, four schemes of “planar” semicoherent interfaces, in which mismatches in interatomic distances are accommodated by two or three sets of edge misfit dislocations, were plotted. Such types of conjugation are observed on side and end interfaces of lamellas in titanium alloys. The procedure developed by J.H. van der Merwe and G.J. Shiflet was used for estimation of specific energy of interphase boundaries in Ti-6Al-4V alloy. Effect of temperature and content of alloying elements on lattice parameters and elastic properties of the - and - phases in Ti-6Al-4V alloy was taken into account for calculations. This approach allowed one to estimate the change in the energy of interphase boundaries in the alloy in temperature interval 600–975C, where diffusion / transformation and enrichment of -phase by vanadium are observed. It was shown that the energy of interphase boundaries in Ti-6Al-4V alloy decreased by 1.3–1.5 times with increasing temperature from 600 to 975C at all examined types of conjugation. Depending on the structure the energy of interphase boundaries can vary from 0.201 to 0.337 J/m2 at 975C and from 0.298 to 0.429 J/m2 at 600C.
Received: 01 December 2016   Revised: 01 March 2017   Accepted: 01 March 2017
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