Characterization and modeling of the high temperature flow behavior of aluminum alloy 2024 |
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Authors: | P L Charpentier B C Stone S C Ernst J F Thomas |
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Affiliation: | (1) 909 Ruth Street, 15243 Pittsburgh, PA;(2) Mead Corporation, Miamisburg, OH;(3) Department of Welding Engineering, The Ohio State University, Columbus, OH;(4) Mechanical Systems Engineering Department, Wright State University, 45435 Dayton, OH |
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Abstract: | Isothermal flow curves were determined for aluminum alloy 2024-0 at temperatures of 145 to 482 °C and at constant true-strain
rates of 10-3 to 12.5 s-1 using compression tests of cylindrical specimens. The average pressure was corrected for friction and for deformation heating
to determine the flow stress. At 250 °C and above, the isothermal flow curves usually exhibited a peak followed by flow softening.
At 145 °C the flow curves exhibited strain hardening. For 250 °C≦ T<= 482 °C, 10-3 s-1 ≦
≦ 12.5 s-1, and ε ≦ 0.6 the flow behavior was represented by the constitutive equation σ =K (T, ε)
where logK andm are simple functions of temperature and strain. The as-deformed microstructures generally supported the idea that flow softening
in Al 2024-0 is caused by dynamic recovery. At the higher temperatures and strain rates, however, fine recrystallized grains
were observed in local areas near second phase particles and at as-annealed grain boundaries. At 482 °C, there was evidence
of re-dissolution of the CuMgAl2 precipitate.
Formerly Visiting Associate Professor, Wright State University, Dayton, OH 45435
Formerly a Mechanical Systems Engineering Student at Wright State University
Formerly a Materials Engineering Student at Wright State University
Formerly Director, Metallurgy Program, National Science Foundation, Washington, DC |
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