Predictive Modeling of the Nonuniform Deformation of the Aluminum Alloy 5182

[+] Author and Article Information
M. E. Bange, A. J. Beaudoin

Department of Industrial and Mechanical Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

M. Stout, S. R. Chen

Los Alamos National Laboratory, Los Alamos, NM 87545

S. R. MacEwen

Alcan International Ltd., Kingston, Ontario, Canada

J. Eng. Mater. Technol 122(2), 149-156 (Nov 13, 1999) (8 pages) doi:10.1115/1.482780 History: Received April 13, 1999; Revised November 13, 1999
Copyright © 2000 by ASME
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Yield stress data for AA 5182 plotted in the appropriate manner for solute drag. The line, n=3, represents a strain rate exponent of 1/3. Deviation from the dashed line provides an indication of an active mechanism other than solute drag.
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Simple notion that the deformed geometry at two distinct cross sections 1 and 2 will reflect the strain rate sensitivity m, following from force balance
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Effective stress from finite element simulations plotted in units of ln(σII/μ): (A) undeformed specimen; (B) solute drag regime (SD); (C) thermally activated hardening and recovery (HR)
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Final specimen geometry based on simulations
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Thermocouple positions and general experimental setup used for temperature verification (drawing not to scale)
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Specimen temperature recorded at the three thermocouple positions shown in Fig. 5
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Comparison of the deformed geometry: (A) for the simulations and (B) for the experiments. Shadow graphs shown in (B) contain the minor axis of the center section.
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Comparison of the deformed geometry from the experiment and simulation for solute drag and HR
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Comparison of load-displacement curves between the simulation and the experiment for both HR and SD regimes
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Micrograph of specimen deformed in the solute drag regime with ram velocity of vz=0.025 mm/s: (A) unrecrystallized structure with compression axis oriented vertically; (B) magnification of bulged section with compression axis oriented horizontally; (C) further magnification of the bulged region, with compression axis oriented horizontally, showing serrated grain boundaries
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Micrograph of specimen deformed in the hardening and recovery regime with a ram velocity of vz=25 mm/s: (A) recrystallized structure with variation in grain size along vertical compression axis; (B) magnification of bulged section with compression axis oriented horizontally and revealing fine grains along regions of shear; (C) further magnification of the bulged region, with compression axis oriented horizontally
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Strain rate jump test at 400°C with strain rates of 1, 10−3, and 1 s−1 on homogeneous compression specimens



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