Effect of transient change in strain rate on plastic flow behaviour of Al-Zn-Mg-Cu alloy at elevated temperatures

authored by: P. Petrov, B. Behrens, H. Conrads
Abstract: In industrial practice of hot forging, i. e. extrusion-type forging, abrupt changes in strain rate during the deformation of the material occur. For accurate numerical simulation of a forging process, the experimental investigation of the effect of the transient change in strain rate on plastic flow behaviour is necessary. The present paper deals with the investigation of this effect on the flow stress of an Al-Zn-Mg-Cu alloy during its deformation at 450°C. During continuous uniaxial compression loading of a cylindrical specimen, the strain rate was abruptly increased or decreased from its initial value at engineering strain of ~26 %. From the beginning of the upsetting up to the strain of ~26 % the value of the strain rate was constant and equal to either 1 s^-1 or 10 s^-1. At the strain of ~26 % the value of the strain rate was either increased to 10 s^-1 or decreased to 1 s^-1. The results of the experimental investigations were used to determine the isothermal flow stress-strain curves of the Al-Zn-Mg-Cu alloy. On the basis of these curves, the strain rate sensitivity index m as a function of true strain as well as temperature was determined.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
External Organisation(s): Moscow State Technical University (MAMI)
Type: Article
Journal: International Journal of Material Forming
Volume: 3
Pages: 355-358
No. of pages: 4
ISSN: 1960-6206
Publication date: 12.06.2010
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Materials Science
Electronic version(s): https://doi.org/10.1007/s12289-010-0780-6 (Access: Unknown)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{d414f930d6da459c98324cc1d3969ca6,
title = "Effect of transient change in strain rate on plastic flow behaviour of Al-Zn-Mg-Cu alloy at elevated temperatures",
abstract = "In industrial practice of hot forging, i. e. extrusion-type forging, abrupt changes in strain rate during the deformation of the material occur. For accurate numerical simulation of a forging process, the experimental investigation of the effect of the transient change in strain rate on plastic flow behaviour is necessary. The present paper deals with the investigation of this effect on the flow stress of an Al-Zn-Mg-Cu alloy during its deformation at 450°C. During continuous uniaxial compression loading of a cylindrical specimen, the strain rate was abruptly increased or decreased from its initial value at engineering strain of ~26 %. From the beginning of the upsetting up to the strain of ~26 % the value of the strain rate was constant and equal to either 1 s-1 or 10 s-1. At the strain of ~26 % the value of the strain rate was either increased to 10 s-1 or decreased to 1 s-1. The results of the experimental investigations were used to determine the isothermal flow stress-strain curves of the Al-Zn-Mg-Cu alloy. On the basis of these curves, the strain rate sensitivity index m as a function of true strain as well as temperature was determined.",
keywords = "Aluminium alloy, Extrusion-type forging, Flow stress-strain curve, Hot forging, Numerical simulation, Transient change in strain rate",
author = "P. Petrov and B. Behrens and H. Conrads",
note = "Funding information: The authors would like to thank the cooperation program between German Academic Exchange Service (DAAD) and Russian Ministry of Education for the financial support of this work (project No. RNP-2.2.2.3.8179). The experimental investigations as well as numerical simulation were carried out at IFUM, Leibniz Universit{\"a}t Hannover. One of the authors (P.P) is grateful to M.Sc. I. El-Galy for fruitful discussions within the scope of the paper.",
year = "2010",
month = jun,
day = "12",
doi = "10.1007/s12289-010-0780-6",
language = "English",
volume = "3",
pages = "355--358",
journal = "International Journal of Material Forming",
issn = "1960-6206",
publisher = "Springer Paris",
number = "SUPPL. 1",
}