Growth of (αTi) Grain-Boundary Layers in Ti–Co Alloys
A. S. Gornakovaa, *, S. I. Prokofieva, **, B. B. Straumalb, ***, and K. I. Kolesnikovab, ****
Translated by N. Korovin
aInstitute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia
bNational University of Science and Technology MISiS, Moscow, 119049 Russia
Correspondence to: *e-mail: alenahas@issp.ac.ru
Correspondence to: **e-mail: prokof@issp.ac.ru
Correspondence to: ***e-mail: straumal@issp.ac.ru
Correspondence to: ****e-mail: kolesnikova@misis.ru
Received 29 January, 2015
Abstract—The influence of temperature on the formation of the (αTi) grain-boundary interlayer in alloys Ti–2 wt % Co and Ti–4 wt % Co in the two-phase region (αTi) + (βTi) of the Ti–Co phase diagram is studied in a temperature range of 690–810°C. The growth kinetics of the thickness (Δ) of the grain-boundary interlayer of the (αTi) phase in the Ti–2 wt % Co alloy is investigated at 750°C. Δ depends on the annealing time as ~ t1/3. The analysis of the results of experimental observations makes it possible to assume that an increase in Δ is the manifestation of coalescence of (αTi), which is controlled by the bulk diffusion.
Keywords: titanium alloys, cobalt, decomposition of supersaturated solid solution, second phase precipitation, grain boundaries, kinetics, diffusion, coalescence
DOI: 10.3103/S1067821216070099