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,2021,50(1):242~248.[Dan Huang,Zhuo Li,Xudong Zhou,Fangtong Yuan,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.]
Al-Zn-Mg-Cu系铝合金动态冲击响应行为研究
投稿时间:2020-01-14  修订日期:2020-09-18
中文关键词:  Al-Zn-Mg-Cu铝合金  动态冲击响应  应变速率  绝热剪切
基金项目: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
中文摘要:
      研究航空航天材料的Al-Zn-Mg-Cu系铝合金的抗冲击性能,对拓展其在工程中的极端应用意义重大。选择7A04-T6铝合金为具体研究对象,利用分离式霍普金森压杆装置,开展不同温度及平均应变速率下材料动态力学响应的研究,明确了材料在极端条件下的服役表现。研究结果表明:当环境温度为25℃-150℃的高速冲击下,材料的内部热软化效应在其与加工硬化的竞争中占优,造成材料流变应力下降;且随平均应变速率增大,材料流变应力上升,屈服强度随平均应变速率增加而增加,表现为明确的应变率硬化效应;高速冲击下材料内部可出现绝热剪切现象,并伴生有宏观裂纹;高速形变引发的材料内部绝热温升叠加环境温度后,可使局部剪切带位置处的增强相达到固相溶解条件,材料在远低于相变温度时发生断裂失效。
Research on Dynamic Shock Response Behavior of Al-Zn-Mg-Cu Aluminum Alloy
英文关键词:Al-Zn-Mg-Cu Al-Alloy  Dynamic impacting response  Strain rate  Adiabatic shear
英文摘要:
      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.
作者单位E-mail
黄丹 河南理工大学材料科学与工程学院 huangdan@hpu.eud.cn 
李卓 河南理工大学材料科学与工程学院  
周旭东 河南理工大学材料科学与工程学院  
原房彤 河南理工大学材料科学与工程学院  
赵武 河南理工大学机械与动力工程学院 zhaowu@hpu.edu.cn 
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