Features of the crystal structure of disperse carbides in alpha titanium

Abstract

Investigations of disperse nonmetallic inclusions in unalloyed alpha titanium VT1-0 have been performed by using transmission electron (including scanning and high-resolution) microscopyyesBelgorod State Universit

Investigations of the thermal stability of the submicrocrystalline titanium

“…Actually, the existence of dispersed partially coherent carbides has been revealed in technically pure titanium (VT1-0) after various thermal treatments [7]. Fine-grained titanium carbides of lamellar morphology were also observed in our experiments on studying grain growth.…”

“…5a). The particle material, as mentioned previously [7], were identified as carbide with an fcc sublattice of titanium atoms (Fig. 5b).…”

“…Spectra of characteristic electron energy losses for the α-phase (a) and for the titanium carbide particle presented in Fig. 5 (b) [7].…”

“…Precipitates that impede migration of grain boundaries in titanium are carbides, which can form in hexagonal close packed (hcp) titanium due to low solubility of carbon at low temperatures. In fact, in the works of the authors [7], it was found that fine partially coherent particles exist in technically pure titanium (VT1-0) after different heat treatments. Other authors relate the process of stabilizing of grain boundaries in NS titanium to grain boundary segregations of carbon [4].…”

“…Image of titanium carbide particles in NS titanium after annealing at 683 K: particles in a grain (scanning TEM) (a) and a single particle (b): the axis of the fcp matrix zone is [2 1 10] and the axis of the fcc particle is [011] (high-resolution TEM with Fourier transformation of the image elements (top: from the matrix, bottom: from the particle)[7].…”