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黄丹,李卓,周旭东,原房彤,赵武.Al-Zn-Mg-Cu系铝合金动态冲击响应行为研究[J].稀有金属材料与工程(英文),2021,50(1):242~248.[Dan Huang,Zhuo Li,Xudong Zhou,Fangtong Yuan and Wu Zhao.Research on Dynamic Shock Response Behavior of Al-Zn-Mg-Cu Aluminum Alloy[J].Rare Metal Materials and Engineering,2021,50(1):242~248.]
Research on Dynamic Shock Response Behavior of Al-Zn-Mg-Cu Aluminum Alloy
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Received:January 14, 2020  
Key words: Al-Zn-Mg-Cu Al-Alloy  Dynamic impacting response  Strain rate  Adiabatic shear
Foundation item:国家自然科学基金U1604140;国家自然科学基金51102080;河南省科技厅重点攻关112102210244;省重大成果培育NSFRF170503;创新团队T2019-5
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Dan Huang,Zhuo Li,Xudong Zhou,Fangtong Yuan and Wu Zhao  
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      Investigation of the impact resistance of Al-Zn-Mg-Cu alloys as aerospace materials is of great significance to expanding its extreme applications in engineering.In this paper, taking 7A04-T6 as the specimen material, the experimental study of dynamic mechanical response of materials at different temperatures and strain rates is carried out withthe split Hopkinson pressure bar device.The results show that,undertheexperimental temperature within 25℃-150℃, the thermal softening effect in the high-speed impacted material takes advantage of the competition with the work hardening, resulting in the decrease of the material"s flow stress. With the increase of average strain rate, both the flow stress and the yield strength of the material increase, which indicates an obviousstrain rate hardening effect.Adiabatic shear phenomenon can occur in the material under high-speed impacting, accompanied by macroscopic cracks. When the adiabatic temperature rise is superimposed on the experimental temperature, it fulfills the solid dissolution condition for the reinforcementphases in local adiabatic shear bands, and the fracture failure of the material occurs when it is much lower than the phase transition temperature.