In-situ study of rules of nanostructure evolution, severe plastic deformations, and friction under high pressure

Severe plastic deformations under high pressure are used to produce nanostructured materials but were studied ex-situ. Rough diamond anvils introduced reach maximum friction equal yield strength in shear and the first in-situ study of evolution pressure-dependent radial distribution nanostructural parameters performed for severely pre-deformed Zr. ω-Zr behaves like perfectly plastic, isotropic, strain-path-independent reaches steady values crystallite size dislocation density, which pressure-, strain- strain-path-independent. However, states α-Zr obtained with smooth rough different, causing major challenge plasticity theory.