Source: https://lettersonmaterials.com/en/Readers/Article.aspx?aid=1077
Timestamp: 2019-04-20 10:47:37+00:00

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The research of formation and the following evolution of ω-phase in pseudo single crystal α-zirconium during the deformation in Bridgman anvils at a pressure of 8 GPa, room temperature with the variety of the angles of rotation of the anvil has been made by TEM. Has been discovered that phase α→ω transformation occurs not in the whole material, but in the areas of pre-existing deformation twins. The initiation of development of processes of dynamic recrystallization by the deformation of zirconium to megaplastic values (е≥5) under pressure has been detected. This is based on direct TEM-observations of regular polyhedra-shaped grains with varying degrees of defects of the internal microstructure. The effect of dynamic recrystallization in zirconium occurs due to the low level of thermal activity. The stabilization of structural elements of both α- and ω-phases has been observed while reaching the deformation degree е≥8. At this stage of deformation speed of accumulation of defects in grain and movements of the growing grain is limited by the ratio of development of competing processes of fragmentation and dynamic recrystallization. Extremely deformed microstructure contains of misaligned to different angles microcrystallites average size 40-50 nm with visible edges. Microcrystallites of ω-phase have lots of defects in their internal microstructure while crystallites of α-phase do not contain any defects. The presence of orientation bonding of ω and α phases after mega-deformation has been detected, which witness the realization of ω→α transformation after the completion of the tests.
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