Al-Zn-Mg-Cu系铝合金动态冲击响应行为研究  

Research on Dynamic Shock Response Behavior of Al-Zn-Mg-Cu Aluminum Alloy

作　　者：黄丹[1,2] 李卓 周旭东 原房彤 赵武 Huang Dan;Li Zhuo;Zhou Xudong;Yuan Fangtong;Zhao Wu(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Henan International Joint Research Laboratory for High-Performance Light Metallic Materials and Numerical Simulations,Jiaozuo 454003,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454003 [2]河南省高性能轻金属材料及数值模拟国际联合实验室,河南焦作454003 [3]河南理工大学机械与动力工程学院,河南焦作454003

出　　处：《稀有金属材料与工程》2021年第1期242-248,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(U1604140,51102080);河南省科技厅重点攻关项目(112102210244);省重大成果培育项目(NSFRF170503);创新团队项目(T2019-5)。

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(SHPB)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:当在环境温度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。Investigation of the impact resistance of Al-Zn-Mg-Cu alloys as aerospace materials is of great significance to expand the extreme applications of alloy in engineering.In this research,taking 7A04-T6 as the specimen material,the study of dynamic mechanical response of materials at different temperatures and strain rates is carried out with the split Hopkinson pressure bar device.The results show that under the experimental temperature within 25~150℃,the thermal softening effect in the high-speed impacted material takes advantage in 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 obvious strain rate hardening effect.Adiabatic shear phenomenon occurs in the material under high-speed impacting,accompanied with macroscopic cracks.When the adiabatic temperature rise is superimposed on the experimental temperature,it fulfills the solid dissolution condition for the reinforcement phases in local adiabatic shear bands,and the fracture failure of the material occurs when the material temperature is much lower than the phase transition temperature.

关 键 词：AL-ZN-MG-CU系铝合金 动态冲击响应 应变速率 绝热剪切 

分 类 号：TG146.21[金属学及工艺—金属材料]