Deformation behavior of Zr-Nb alloys under uniaxial compression, accompanied by
phase transformations, is considered by the example of Zr-1%Nb and Zr-2.5%Nb alloys. Model
samples were deformed at temperatures of β- and (α+β)-regions of the phase diagram Zr-Nb.
Mechanisms, responsible for plastic deformation of alloys by different temperature-rate regimes,
were determined on the basis of textures, arising in deformed samples. Among these mechanisms
there are crystallographic slip in grains of β-Zr and α-Zr as well as mutual displacements of
crystallites along interphase boundaries. The latter mechanism sharply intensifies under conditions
of α↔β phase transformations and lies in the basis of superplasticity. An input of each mechanism
into plastic deformation of material depends on the temperature-rate regime of compression and
determines its anisotropy.
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