Hot Deformation Behavior and Dynamic Recrystallization Kinetics of a Novel Sc and Zr Modified Ultra-high-strength Al-Zn-
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JMEPEG https://doi.org/10.1007/s11665-020-05255-1
Hot Deformation Behavior and Dynamic Recrystallization Kinetics of a Novel Sc and Zr Modified Ultra-high-strength Al-Zn-Mg-Cu Alloy B. Li, Z.J. Chu, Y. Du, W. Zhou, and X. Zhou Submitted: 29 July 2020 / Revised: 14 September 2020 / Accepted: 3 October 2020 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 s21. 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. Keywords
Al-Zn-Mg-Cu alloy, constitutive equation, dynamic recrystallization, hot deformation behavior, microstructural evolution
1. Introduction As a typical age-hardenable alloys, 7000 series aluminum alloys were widely used and successfully developed as structural materials in the field of high speed train, aircraft manufacturing and automobile due to the good corrosion resistance, extremely high strength and relatively low density (Ref 1-3). With the development of advanced aircraft, the aircraft design has continuously increased the requirements for overall performance, service life, safety and reliability, structural quality control, etc. Thus, a new generation ultra-highstrength Al-Zn-Mg-Cu alloy with higher comprehensive performance was strongly demanded in the aviation industry. As is well known, high alloying is the current research and development trend in Al-Zn-Mg-Cu alloys (Ref 4). However, chasing high alloying can bring difficulties to the production of such alloys, such as rolling cracking, enhanced quenching sensitivity, decreased machining performance and increased costs. B. Li, College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, PeopleÕs Republic of China; and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PeopleÕs Republic of China; Z.J. Chu, W. Zhou, and X. Zhou, College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, PeopleÕs Republic of China; and and Y. Du, State Key Laboratory of Powder
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