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Research Papers

Development of Localized Deformation in AA 2024-O

[+] Author and Article Information
S. Kweon

Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801skweon2@uiuc.edu

A. J. Beaudoin

Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801abeaudoi@uiuc.edu

P. Kurath

Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801pkurath1@uiuc.edu

M. Li

 Alcoa Technical Center, Alcoa Center, PA 15069ming.li@alcoa.com

J. Eng. Mater. Technol 131(3), 031009 (May 29, 2009) (8 pages) doi:10.1115/1.3078301 History: Received June 24, 2008; Revised December 04, 2008; Published May 29, 2009

An experimental study is presented to (1) quantify the rate-sensitive mechanical response and (2) examine the localized deformation behavior under an applied temperature gradient in the alloy AA 2024. Isothermal flow stresses are obtained at temperatures from 100°C to 495°C and strain rates from 102/s to 105/s using routine compression tests and a novel cyclic test, which expedites the characterization. The material displays two distinct kinetic responses with both being amenable to localization phenomena. The lower temperature/high strain rate regime displays a rate-insensitive yield with Stage III/IV work hardening. At higher temperature/low strain rates, a rate-sensitive response with little work hardening is observed. In order to relate the material constitutive behavior to the development of localized deformation, a temperature gradient test is performed wherein temperature differences of approximately 30°C are enforced between the top and bottom surfaces of a cylindrical compression test specimen. Deformation heterogeneity developed in the two distinct regimes of material response is illustrative of warm and hot working conditions typical of industrial processes, such as rolling.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Incremental step test

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Figure 2

Small and large strain compression tests

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Figure 3

Temperature gradient test

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Figure 4

Constitutive response of AA 2024-O

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Figure 5

Stress strain curves and the fitting result

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Figure 6

Deformed shapes in temperature gradient test: (a) g1/2>0.5 and (b) g1/2<0.41

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Figure 7

Microstructures in temperature gradient test: (a) g1/2>0.5 and (b) g1/2<0.41

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Figure 8

Effective strain rate taken from simulations with friction coefficient μ=0.05 used for both top and bottom surfaces: (a) g1/2>0.5 and (b) g1/2<0.41

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Figure 9

Effective strain rate following from an adjusted friction coefficient, applied at the top surface: (a) g1/2>0.5 and (b) g1/2<0.41

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Figure 10

g1/2 values calculated in the simulation: (a) g1/2>0.5 and (b) g1/2<0.41

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Figure 11

Edge cracks in a rolled plate of an aluminum alloy, AA 2024

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