Severe plastic deformations under high pressure are used to produce nanostructured materials but were studied ex-situ. We introduce rough diamond anvils to reach maximum friction equal to yield strength in shear and perform the first in-situ study of the evolution of the pressure-dependent yield strength and nanostructural parameters for severely pre-deformed Zr. {\omega}-Zr behaves like perfectly plastic, isotropic, and strain-path-independent. This is related to reaching steady values of the crystallite size and dislocation density, which are pressure-, strain- and strain-path-independent. However, steady states for {\alpha}-Zr obtained with smooth and rough anvils are different, which causes major challenge in plasticity theory.
@article{arxiv.2303.13007,
title = {In-situ study of rules of nanostructure evolution, severe plastic deformations, and friction under high pressure},
author = {Feng Lin and Valery I. Levitas and Krishan K. Pandey and Sorb Yesudhas and Changyong Park},
journal= {arXiv preprint arXiv:2303.13007},
year = {2023}
}
Comments
arXiv admin note: substantial text overlap with arXiv:2208.08022