Deformation behavior of an Al–Cu–Mg–Mn–Zr alloy during hot compression

• Published in: Journal of materials science 2011-06, Vol.46 (11), p.3708-3715
• Main Authors: Li, Yao, Liu, Zhiyi, Lin, Lianghua, Peng, Jiangtao, Ning, Ailin
• Format: Article
• Language: English
• Subjects: Activation energy; Alloys; Aluminum; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Compression tests; Copper; Crystallography and Scattering Methods; Deformation mechanisms; Dispersions; Dynamic recrystallization; High temperature; Hot pressing; Hot working; Hyperbolic functions; Magnesium; Manganese; Materials Science; Polymer Sciences; Precipitation (Meteorology); Process mapping; Solid Mechanics; Specialty metals industry; Strain rate; Transmission electron microscopes; Trigonometric functions; True strain; True stress; Zirconium; Zirconium alloys; Zirconium base alloys
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-010-5143-7

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 −1 . 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 Al 3 Zr and Al 20 Cu 2 Mn 3 dispersoids during hot deformation restrained DRX and increased the hot deformation activation energy of the alloy.