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, Universität Wien

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://ucris.univie.ac.at/portal/en/publications/significance-of-strain-rate-in-severe-plastic-deformation-on-steadystate-microstructure-and-strength(3339a101-9f7e-48fb-8ad5-dfd810f6994f).html