In order to study the dynamic mechanical properties of TiZrNbHf RHEA under dynamic impact,a flat plate impact experiment was carried out by using a 20mm caliber first-stage light gas gun,and the recovered samples were analyzed by scanning electron microscopy on their delamination mechanism from a microscopic perspective.The results show that the de-lamination strengths of TiZrNbHf RHEA ranges from 1.81 to 2.41 GPa when the peak pressure of plastic wave pressure ranges from 0 to 20GPa.The delamination strength of TiZrNbHf RHEA is lower than that of 3d-HEA.The Hugoniot elastic limit ranges from 3.05GPa to 3.57GPa,increases with the increasing of impacting speed,and the reacceleration increases with the in-creasing of impacting speed.The Hugoniot equation of state obtained by the experiment shows a linear relationship.The state equation obtained by the cold energy mixing method is lower than the test data,but it can be used to predict the materials'properties over the experimental range.The metallographic analysis of the recovered samples shows that the SE and BSE image maps show that the holes are connected to form cracks,there are a large number of dimple and a small number of river-like patterns in the damage area,indicating that the damage mode is a mixed fracture mode dominated by ductile fracture.
关键词
材料力学/难熔高熵合金/层裂特性/Hugoniot弹性极限/Hugoniot状态方程/平板撞击试验
Key words
material mechanics/refractory high entropy alloy/spalling behavior/Hugoniot elastic limit/Hugoniot equation of state/plate impact experiment
维普
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