High Strain Rate Deformation Behavior of Gradient Rolling AZ31 Alloys
Yingjie Li,
Hui Yu,
Chao Liu,
Yu Liu,
Wei Yu,
Yuling Xu,
Binan Jiang,
Kwangseon Shin,
Fuxing Yin
Affiliations
Yingjie Li
Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
Hui Yu
Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
Chao Liu
Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
Yu Liu
School of Materials Science and Engineering, Hunan University, Changsha 410082, China
Wei Yu
School of Materials Science and Engineering, Hefei University of Technology, Hefei 200039, China
Yuling Xu
Baosteel Metal Co., Ltd., Shanghai 200940, China
Binan Jiang
PLA Army Academy of Artillery and Air Defense, Hefei 230031, China
Kwangseon Shin
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
Fuxing Yin
Institute of New Materials, Guangdong Academy of Science, Guangzhou 510651, China
A dynamic impact test was performed on as-rolled AZ31 alloys with gradient microstructure under various strains. The microstructural evolution and mechanical properties were systematically investigated. As the strain rate gradually increased, an increasing number of twins were formed, facilitating dynamic recrystallization (DRX), and the mechanical properties were also gradually improved. The microstructure became heterogeneous at higher strain rates, but the peak stress decreased. The impact process resulted in a significantly higher performance due to microstructural refinement, work hardening by dislocations, and precipitates. In addition, both the adiabatic shear band and the adjacent crack experienced a temperature rise that exceeded the recrystallization temperature of the alloys. This observation also explains the presence of ultrafine recrystallized grains within the adiabatic shear band and the appearance of molten metal around the crack.
