Electron Energy Spectra of Elastically and Discretely Scattered Electrons of the Ti–6Al–4V Alloy Fracture Surface after Radial Shear Rolling at a Temperature of 1000°С
2021
The change in the spectra of elastically and discretely scattered electrons in
Ti–6Al–4V alloy subjected to radial shear rolling at T = 1000°C was studied in comparison with the initial state.
Interatomic bonds in the equilibrium α phase of the alloy are formed by Al sp
electrons, and their contribution is small. Quenching after radial shear rolling
at T = 1000°C causes the formation of a
nonequilibrium αʹ phase in the α phase. The resulting αʹ phase contains vanadium
atoms whose d electrons are part of the interatomic bond. As a result, the α
phase is strengthened and the low-temperature toughness of the alloy is
enhanced. At the same time, sp electrons are strongly scattered by vanadium ions
and therefore their contribution to the interatomic bond is weakened. This
generates localized plastic flows in the lattice curvature zones, which develop
in the field of Coulomb repulsion of electrons and govern a high relaxation
ability of the alloy at low temperatures. Very high strengthening is found to be
fundamentally related to a very high relaxation factor. The results are
explained by the effect of structural transformation.
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