Flow Stress Behavior and Microstructural Evolution of a High-Alloying Al–Zn–Mg–Cu Alloy
The flow behavior of a high-alloying Al–Zn–Mg–Cu alloy was studied by compression tests with the temperature range of 300–440 °C and the strain rates range of 0.001–1 s−1, and the corresponding microstructural evolution was observed. Results show flow stress curves exhibit the peak value at a critical strain, and the peak stress decreases with increasing of deformation temperatures. Numerous precipitated particles with a small size and high-density dislocations should be responsible for the high flow stress. Dynamic recovery is the main way of flow softening while dynamic coarsening of precipitated particles and dynamic recrystallization also play a role in flow softening under low-temperature and high-temperature conditions, respectively. The continuous dynamic recrystallization is the major mechanism for dynamic recrystallization behavior.
KeywordsAl–Zn–Mg–Cu alloy Hot deformation Flow behavior Microstructural evolution
This study was financially supported by the National Key R&D Program of China (No. 2016YFB0300803, 2016YFB0300903), the National Program on Key Basic Research Project of China (No. 2012CB619504) and National Natural Science Foundation of China (No. 51274046).
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