Hot Deformation Behavior and Dynamic Recrystallization Kinetics of a Novel Sc and Zr Modified Ultra-high-strength Al-Zn-Mg-Cu Alloy

Autor: W. Zhou, Yong Du, Z. J. Chu, Bin Li, Xiangman Zhou
Rok vydání: 2020
Předmět:
Zdroj: Journal of Materials Engineering and Performance. 29:7774-7784
ISSN: 1544-1024
1059-9495
Popis: In this paper, the hot deformation behavior and dynamic recrystallization (DRX) kinetics of a novel Sc and Zr-modified ultra-high-strength Al-Zn-Mg-Cu alloys were researched under various conditions. The influence of hot processing parameters on the DRX behavior was investigated. The microstructural evolution of the studied alloys under different deformation conditions was analyzed through transmission electron microscope and optical microscope. The stress–strain curves exhibit the typical single-peak DRX characteristics. The dynamic recrystallization grains can be observed at 450 °C/1 s−1. The results show that the dynamic recrystallization is more obvious with the increase in deformation temperature or the decrease in strain rate. The DRX critical strain model and the DRX volume fraction model are established by the Avrami equation and experimental data. The DRX volume fraction increases with the increase in temperatures or the decrease in strain rates. Through comparative analysis, it is found that the calculation results are in good agreement with experiment results, showing that the kinetic models can accurately describe the DRX characteristics of the studied alloys during hot deformation.
Databáze: OpenAIRE
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