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Research Papers

Influence of Thermomechanical Parameters on the Hot Deformation Behavior of AA1070

[+] Author and Article Information
H. R. Rezaei Ashtiani

Department of Mechanical Engineering,
Arak University of Technology,
Arak 38181-41167, Iran;
School of Mechanical Engineering Department of
Solid Mechanics,
Iran University Science and Technology,
Narmak, Tehran, Iran
e-mail: hr_rezaei@iust.ac.ir,
hr_rezaei@arakut.ac.ir

H. Bisadi

School of Mechanical Engineering
Department of Solid Mechanics,
Iran University Science and Technology,
Narmak, Tehran, Iran

M. H. Parsa

School of Metallurgy and Materials Engineering,
College of Engineering,
University of Tehran,
Tehran, Iran

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received August 5, 2012; final manuscript received May 12, 2013; published online November 20, 2013. Assoc. Editor: Ashraf Bastawros.

J. Eng. Mater. Technol 136(1), 011004 (Nov 20, 2013) (6 pages) Paper No: MATS-12-1191; doi: 10.1115/1.4025695 History: Received August 05, 2012; Revised May 12, 2013

The experimental stress–strain data from isothermal hot compression tests, in a wide range of temperatures (350–500 °C) and strain rates (0.005–0.5 s−1), were employed to develop constitutive equations in a commercially pure aluminum (AA1070). The effects of temperature and strain rate on the hot deformation behavior were represented by Zener–Hollomon parameter including Arrhenius term. The results show that the hardening rate and flow stress are evidently affected by both deformation temperature and strain rate. The power law, exponential, and hyperbolic sinusoidal types of Zener–Hollomon equations were used to determine the hot deformation behavior of AA1070. The results suggested that the highest correlation coefficient was achieved for the hyperbolic sine law for the studied material. So the proposed deformation constitutive equations can give an accurate and precise estimate of the flow stress for AA1070, which means it can be used for numerical simulation of hot forming processes and for choosing proper forming parameters in engineering practice accurately.

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References

Figures

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Fig. 1

PLM microstructure of AA1070 polycrystalline specimen

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Fig. 2

Thermomechanical schematic used to compress samples that represents processing conditions

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Fig. 3

True stress–true strain curves for various temperatures at different strain rate of (a) 0.005 s−1, (b) 0.05 s−1, and (c) 0.5 s−1

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Fig. 4

Work hardening rate (θ) versus flow stress (σ) at strain rate of (a) 0.005 s−1, (b) 0.05 s−1, and (c) 0.5 s−1

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Fig. 5

Evaluating the value of (a) n' by fitting lnσp−lnɛ·, (b) β by fitting σp−lnɛ·

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Fig. 6

Evaluating the value of (a) n by fitting ln[sinh(ασp)]−lnɛ·, (b) Q by fitting ln[sinh(ασp)] − 1/T

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Fig. 7

The variation of LnZ with (a) Ln σp, (b) σp, and (c) Ln sinh (ασp) to obtain the consequence regression constant between the peak stress (σp) and Z

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Fig. 8

Correlation between the experimental and predicted flow stress data from the developed constitutive equation

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