К вопросу об устойчивости метастабильной omega-фазы в псевдомонокристаллическом цирконии

Abstract

In the Bridgman chamber at temperatures of 20, 70, 100, 300 °C and at the identical scheme of loading zirconium pseudo-single samples are tested. The tests were carried out with a research objective of a possibility of maintaining the metastable ω-phase at increased temperatures. Researches showed that in the course of warm deformation, as a result of formation of equilibrium interphase boundaries and the oriented nucleation and growth of a ω-phase, there are stable structural configurations which promote increase in stability of a ω-phase after cooling and removal of loading. In the sample tested at 300 °C dispersion particles of hydride of zirconium, variable structure - δ-ZrH2-h which cause the high hardness comparable with a hardness of the sample which was subjected to tests at the room temperature are found.