Features of the ω-phase formation in zirconium and its alloys under quasi-hydrostatic pressure and dynamic loading

Abstract

X-ray diffraction, optical and transmission electron microscopy and measurement of microhardness were used to study zirconium, Zr–Ti and Zr–Nb alloys loaded by quasi-hydrostatic pressure and spherical converging shock waves of different intensity. It was revealed that the phase and structural states of the specimens depend on the loading type, the loading intensity, the niobium content, and the depth of the layer in the sphere. It has been established that there are two types of defects in the ω-phase structure: linear defects of displacements of [0001] atomic rows and stacking faults in the planes {2¯ 1¯ 10} irregularly distributed on a crystal.

Keywords:

• ω-phase
• Zr and zirconium alloys
• structure
• pressure
• shock waves

Acknowledgement

This study was supported by the program of the Presidium of the RAS: “Thermophysics and mechanics of extreme power influences and physics of strongly compressed substance”.