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

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

doi:10.1016/j.msea.2022.144231

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

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

Publications: Contribution to journal › Article › Peer Reviewed

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.

Original language	English
Article number	144231
Number of pages	8
Journal	Materials Science and Engineering A
Volume	859
DOIs	https://doi.org/10.1016/j.msea.2022.144231
Publication status	Published - 24 Nov 2022

Funding

This work has been supported in part by the Light Metals Educational Foundation of Japan , in part by Grants-in-Aid for Scientific Research on Innovative Areas ( JP19H05176 & JP21H00150 ) and Challenging Research (Exploratory) ( JP22K18737 ) from the MEXT , Japan, and in part by the “Metals and Alloys under Extreme Impacts” Laboratory of Eurasian Center of Excellence, USATU (assignment #075-03-2021-014/4).

Austrian Fields of Science 2012

210004 Nanomaterials
211104 Metallurgy

Keywords

High-pressure torsion (HPT)
Nanostructured materials
Strain-rate hardening
Ultrafine-grained (UFG) materials
Zener-Hollomon parameter

Access to Document

10.1016/j.msea.2022.144231

Cite this

@article{3339a1019f7e48fb8ad5dfd810f6994f,

title = "Significance of strain rate in severe plastic deformation on steady-state microstructure and strength",

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.",

keywords = "High-pressure torsion (HPT), Nanostructured materials, Strain-rate hardening, Ultrafine-grained (UFG) materials, Zener-Hollomon parameter",

author = "Kaveh Edalati and Qing Wang and Enikeev, \{Nariman A.\} and Laura-Jean Peters and Zehetbauer, \{Michael J.\} and Erhard Schafler",

note = "Funding Information: This work has been supported in part by the Light Metals Educational Foundation of Japan , in part by Grants-in-Aid for Scientific Research on Innovative Areas ( JP19H05176 \& JP21H00150 ) and Challenging Research (Exploratory) ( JP22K18737 ) from the MEXT , Japan, and in part by the “Metals and Alloys under Extreme Impacts” Laboratory of Eurasian Center of Excellence, USATU (assignment \#075-03-2021-014/4). Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2022",

month = nov,

day = "24",

doi = "10.1016/j.msea.2022.144231",

language = "English",

volume = "859",

journal = "Materials Science and Engineering A",

issn = "0921-5093",

publisher = "Elsevier Procedia Computer Science",

}

TY - JOUR

T1 - Significance of strain rate in severe plastic deformation on steady-state microstructure and strength

AU - Edalati, Kaveh

AU - Wang, Qing

AU - Enikeev, Nariman A.

AU - Peters, Laura-Jean

AU - Zehetbauer, Michael J.

AU - Schafler, Erhard

N1 - Funding Information: This work has been supported in part by the Light Metals Educational Foundation of Japan , in part by Grants-in-Aid for Scientific Research on Innovative Areas ( JP19H05176 & JP21H00150 ) and Challenging Research (Exploratory) ( JP22K18737 ) from the MEXT , Japan, and in part by the “Metals and Alloys under Extreme Impacts” Laboratory of Eurasian Center of Excellence, USATU (assignment #075-03-2021-014/4). Publisher Copyright: © 2022 Elsevier B.V.

PY - 2022/11/24

Y1 - 2022/11/24

N2 - 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.

AB - 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.

KW - High-pressure torsion (HPT)

KW - Nanostructured materials

KW - Strain-rate hardening

KW - Ultrafine-grained (UFG) materials

KW - Zener-Hollomon parameter

UR - https://www.scopus.com/pages/publications/85140922610

U2 - 10.1016/j.msea.2022.144231

DO - 10.1016/j.msea.2022.144231

M3 - Article

AN - SCOPUS:85140922610

SN - 0921-5093

VL - 859

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

M1 - 144231

ER -

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

Abstract

Funding

Austrian Fields of Science 2012

Keywords

Access to Document

Other files and links

Fingerprint

Cite this