1. Deformation behavior of an Al-Cu-Mg-Mn-Zr alloy during hot compression.
- Author
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Yao Li, Zhiyi Liu, Lianghua Lin, Jiangtao Peng, and Ailin Ning
- Subjects
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DEFORMATION of surfaces , *COMPRESSIBILITY , *TRANSMISSION electron microscopes , *STRAINS & stresses (Mechanics) , *RECRYSTALLIZATION (Metallurgy) - Abstract
Deformation behavior of an Al-Cu-Mg-Mn-Zr alloy during hot compression was characterized in present work by high-temperature testing and transmission electron microscope (TEM) studies. The true stress-true strain curves exhibited a peak stress at a critical stain. The peak stress decreased with increasing deformation temperature and decreasing strain rate, which can be described by Zener-Hollomon ( Z) parameter in hyperbolic sine function with the deformation activation energy 277.8 kJ/mol. The processing map revealed the existence of an optimum hot-working regime between 390 and 420 °C, under strain rates ranging from 0.1 to 1 s. The main softening mechanism of the alloy was dynamic recovery at high ln Z value; continuous dynamic recrystallization (DRX) occurred as deformed at low ln Z value. The dynamic precipitation of AlZr and AlCuMn dispersoids during hot deformation restrained DRX and increased the hot deformation activation energy of the alloy. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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