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

Autor(en)

Kaveh Edalati, Qing Wang, Nariman A. Enikeev, Laura-Jean Peters, Michael J. Zehetbauer, Erhard Schafler

Abstrakt

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(en)

Physik Nanostrukturierter Materialien, Dynamik Kondensierter Systeme

Externe Organisation(en)

Kyushu University, Ufa State Aviation Technical University, Bashkir State University

Journal

Materials Science and Engineering A

Band

859

Anzahl der Seiten

8

ISSN

0921-5093

DOI

https://doi.org/10.1016/j.msea.2022.144231

Publikationsdatum

11-2022

Peer-reviewed

Ja

ÖFOS 2012

210004 Nanomaterialien, 211104 Metallurgie

Schlagwörter

ASJC Scopus Sachgebiete

Materials Science(all), Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering

Link zum Portal

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