STRUCTURAL-PHASE TRANSFORMATIONS IN THE ZIRCONIUM SINGLE CRYSTAL UNDER THE PRESSURE OF THE DEFORMATION

L. Egorova, Y. Khlebnikova, V. Pilyugin, E. Chernyshev

Abstract

At step of deformation from e = 0.5 to e = 4.6, the stage of nucleation of the ω phase is observed only in area of the α-phase, which have a favorable crystallographic orientation. The formation of groups of planar defects in the ω phase is a mechanism for the compensation of elastic stresses during lattice transformation α → ω under conditions of high quasihydrostatic pressure. The figure shows the dark-field image in the reflex (001)ω of the deformed structure at angle of anvil of Bridgman φ=15 grad (e=1.5) of pseudo-single crystal of zirconiumThe structural-phase transformation in pseudo-single crystal of zirconium during deformation on Bridgman anvils is studied by X-ray spectroscopy with synchrotron radiation. The angles of rotation in the Bridgman anvils turning varied from φ = 0 deg to φ = 45 deg. It was shown that the α-phase lattice is compressed at a true strain value e = 4.6, which is reflected in its parameters: the α-phase parameter "α" decreases by 5.3%, and the parameter "c" by 0.3%. On the contrary, the ω-phase arising in the process of deformation under pressure showed a tendency to stretching, if the parameter "a" of this phase practically does not change with an increase in the degree of deformation, then the parameter "c" is insignificant, by 0.14%, but increases. This behavior can probably be explained by the small atomic density and strong anisotropy in terms of the atomic density of the planes and series of the ω-phase. It is determined that the structure arising in the process of deformation of the baric ω-phase, deformation conditions from e = 0.5 to e = 4.6, does not undergo textural changes. At this step of deformation, only the stage of nucleation of the ω-phase is observed only in area of the α-phase, which have a favorable crystallographic orientation. The formation of groups of planar defects in the ω phase is a mechanism for the compensation of elastic stresses during lattice transformation α → ω under conditions of high quasihydrostatic pressure.

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