Evidence of Bulk Nanostructuring in Zr-Based Alloys under Deformation at Temperatures of α↔β Phase Transformations
The deformation behavior of commercial Zr alloys with 1% and 2,5%Nb under compression at temperatures of the (α+β)-region of Zr-Nb phase diagram is considered on the basis of experimental data obtained by X-ray texture study of deformed samples. Mechanisms, responsible for plastic deformation of alloys by different temperature-rate regimes were determined on the basis of resulting textures. Among these mechanisms there are crystallographic slip and mutual displacements of crystallites along interphase boundaries. The latter mechanism sharply intensifies by grain fragmentation down to nanostructuring under conditions of α«β phase transformations. Texture features of deformed samples testify about interaction of plastic deformation with phase transformations and indicate that due to this interaction compression by optimal regimes promotes the utmost refinement of structure elements.
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
M. Isaenkova et al., "Evidence of Bulk Nanostructuring in Zr-Based Alloys under Deformation at Temperatures of α↔β Phase Transformations", Materials Science Forum, Vols. 667-669, pp. 629-634, 2011