Open AccessConstitutive equation and microstructure evaluation of an extruded aluminum alloy
Author(s) -
L. Saravanan,
T. Senthilvelan
Publication year - 2015
Publication title -
journal of materials research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.832
H-Index - 44
eISSN - 2214-0697
pISSN - 2238-7854
DOI - 10.1016/j.jmrt.2015.04.002
Subject(s) - materials science , flow stress , strain rate , arrhenius equation , microstructure , constitutive equation , alloy , compression (physics) , strain (injury) , deformation (meteorology) , atmospheric temperature range , thermodynamics , stress (linguistics) , composite material , metallurgy , activation energy , finite element method , medicine , linguistics , chemistry , physics , philosophy , organic chemistry
The flow-stress behavior of an extruded aluminum alloy has been studied by conducting a set of warm and hot compression tests. The compression tests were carried out in the temperature range of 373K–773K and strain rates of 0.001, 0.01 and 0.1s−1, up to a strain of 0.5. Based on the results obtained from these tests, a mathematical model was obtained to predict flow stress for a given strain. The effect of temperature and strain rate on deformation behavior was ascertained by determining the Zener–Hollomon parameter. The influence of strain has been incorporated by employing an Arrhenius-type constitutive equation, considering the related material constants as functions of strain. The comparison of results indicated good agreement between the predicted and measured flow-stress values in the relevant temperature range. The correlation coefficient and average absolute relative error of the model were found to be 0.9965 and 4.26% respectively confirming good accuracy
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