Metallurgical Engineering

Metallurgical Engineering

Study of restoration mechanism and constitutive equations of AA5456 Aluminum alloy during hot deformation process

Document Type : Research Paper

Authors
Yousef Payandeh 1
Bahman Mirzakhani 2
Navid Nezamabadi 3
Hossein Momeni 4
1 Department of Materials Science & Engineering, Faculty of Engineering, Arak University
2 Department of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran
3 Arak University
4 University Complex of Materials and Manufacturing Technology, Malek-e-Ashtar University of Technology
10.22076/me.2019.108040.1247
Abstract
Understanding softening mechanisms of wrought aluminum alloy during hot deformation processes is important in order to control microstructure and to predict flow stress accurately in simulation. In this paper, hot compression tests have been done to study the hot deformation behavior of an A5456 aluminum alloy. The effect of temperature, strain and strain rate on flow behavior of the alloy has been studied as well. For this meaning, several cylindrical samples with respectively 10 and 15 mm in diameter and length have been subjected to the test at 350, 400, 450, 500 and 550 °C, strain rates of 0.001, 0.01, 0.1, 1 s-1 and strain of 0.7. The samples where then immediately quenched in water in order to study the microstructure. Analysis of the strain – strain curves at different deformation conditions show that the flow stress decreases with increasing the test temperature and decreasing the strain rate. Because of high stacking fault energy of aluminum alloy, the dominant softening mechanism in this alloy is dynamic recovery. From experimental results, the equations governing the hot deformation behavior of the material have been determined at peak stress and activation energy of 182 KJ/mol for hot deformation process has been obtained.
Keywords
A5456 aluminum alloy
hot deformation
dynamic recrystallization
dynamic recovery
constitutive equations
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  • Receive Date 16 May 2019
  • Revise Date 24 July 2019
  • Accept Date 02 November 2019