Publications

Significance of strain rate in severe plastic deformation on steady-state microstructure and strength

Author(s)
Kaveh Edalati, Qing Wang, Nariman A. Enikeev, Laura-Jean Peters, Michael J. Zehetbauer, Erhard Schafler
Abstract

The microstructure and mechanical properties of materials saturate to steady states after severe plastic deformation (SPD). Despite the well-known effect of temperature on the steady-state microstructure, there is no general agreement on the significance of strain rate and the applicability of the Zener-Hollomon parameter in this regard. In this study, several pure metals (aluminum, copper, titanium, and iron) and a Cu–30Zn (wt%) brass alloy have been processed by a high-speed high-pressure torsion (HPT) equipment with controllable rotation speeds in the range of 0.06–60 rpm. It is found that crystallite/grain size, dislocation density, microhardness and shear stress at the steady state are reasonably rate-independent for the von Mises strain rates in the range of 0.004–20 s−1. Because both rates of grain refinement and of dynamic recrystallization are proportional to the strain rate, it is suggested that their balance, which determines the steady state, is rate-independent.

Organisation(s)
Physics of Nanostructured Materials, Dynamics of Condensed Systems
External organisation(s)
Kyushu University, Ufa State Aviation Technical University, Bashkir State University
Journal
Materials Science and Engineering A
Volume
859
No. of pages
8
ISSN
0921-5093
DOI
https://doi.org/10.1016/j.msea.2022.144231
Publication date
11-2022
Peer reviewed
Yes
Austrian Fields of Science 2012
210004 Nanomaterials, 211104 Metallurgy
Keywords
ASJC Scopus subject areas
Materials Science(all), Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering
Portal url
https://ucrisportal.univie.ac.at/en/publications/significance-of-strain-rate-in-severe-plastic-deformation-on-steadystate-microstructure-and-strength(3339a101-9f7e-48fb-8ad5-dfd810f6994f).html