含能材料2024，Vol.32Issue(4)：387-396,10.DOI:10.11943/CJEM2023133
铸态TiZrNbV难熔高熵合金的层裂行为
Spalling Behavior of As-cast TiZrNbV Refractory High Entropy Alloy
摘要
Abstract
The cast TiZrNbV refractory high entropy alloy(RHEA)has high structural strength and good energy release character-istics.As an energetic structural material,it needs to withstand complex dynamic load environments in engineering applications.Studying the spalling behavior of TiZrNbV refractory high entropy alloy and obtaining accurate dynamic constitutive parameters are vital for its engineering application.The spalling characteristics of TiZrNbV RHEA were studied by flat plate impact experi-ment using a 20mm light gas gun.Parameters such as spalling strength,Hugoniot elastic limit(HEL),and plastic strain rate were obtained,based on the free surface velocity history.The recycled specimens were analyzed using scanning electron microscopy(SEM),and the spalling characteristics of TiZrNbV RHEA at different strain rates were analyzed from both macro and micro per-spectives.It was shown that the geometrically necessary dislocation of the samples significantly increased with the increase of loading velocity.The spalling strength of TiZrNbV RHEA increases with the loading strain rate and the loading stress,with values ranging from 0.93 GPa to 2.23 GPa.The GTN-JC constitutive model parameters of TiZrNbV RHEA were obtained by calibrating the free surface velocity history of the spallation experiment with a flyer velocity of 580 m·s-1.The spallation behavior of the sam-ple under 610 m·s-1 flyer velocity loading was calculated by using the fitted parameters.It was indicated that the free surface ve-locity curve of the spallation experiment performed well in simulating the spallation behavior of coarse-grained TiZrNbV RHEA.The simulation results show that the free surface velocity curve is consistent before the first tensile stage,which can be used for the dynamic analysis of sample spalling failure.The obtained parameters can provide reference for the engineering application of TiZrNbV RHEA.关键词
难熔高熵合金/层裂/参数反演/GTN-JC/平板撞击Key words
refractory high entropy alloy/Spalling/Parameter inversion/GTN-JC分类
军事科技引用本文复制引用
陈荣,马荣,王峥,任柯融,张思源,田占东..铸态TiZrNbV难熔高熵合金的层裂行为[J].含能材料,2024,32(4):387-396,10.基金项目
国家自然科学基金(12072369),湖南省杰出青年基金项目(2022JJ10058) National Natural Science Foundation of China(No.12072369),Natural Science Foundation of Hunan Provin-cial(No.2022JJ10058) （12072369）
