Journal
MATERIALS
Volume 13, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/ma13071743
Keywords
Al-Zn-Mg-Cu alloy; constitutive model; processing map; microstructural evolution; dynamic recrystallization
Categories
Funding
- National Key Research and Development Program of China [2016YFB0300900]
- National Key Fundamental Research Project of China [2012CB619506-3]
- National Natural Science Foundation of China [51171209]
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The hot deformation behavior of an Al-Zn-Mg-Cu alloy was investigated by hot compression test at deformation temperatures varying from 320 to 440 degrees C with strain rates ranging from 0.01 to 10 s(-1). The results show that the Mg(Zn, Cu)(2) particles as a result of the sufficient static precipitation prior to hot compression have an influence on flow softening. A constitutive model compensated with strain was developed from the experimental results, and it proved to be accurate for predicting the hot deformation behavior. Processing maps at various strains were established. The microstructural evolution demonstrates that the dominant dynamic softening mechanism stems from dynamic recovery (DRV) and partial dynamic recrystallization (DRX). The recrystallization mechanism is continuous dynamic recrystallization (CDRX). The microstructure observations are in good agreement with the results of processing maps. On account of the processing map and microstructural observation, the optimal hot processing parameters at a strain of 0.6 are at deformation temperature range of 390-440 degrees C and strain rate range of 0.010-0.316 s(-1) with a peak efficiency of 0.390.
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