Quantitative Determination of Impact Reaction Energy Release for HfZrTiTaNb Based High-Entropy Alloys

As a new type of energetic material, high-entropy alloys will release a large amount of energy during high-speed impact, which has important application value. A two-stage light gas gun system was used to load the HfZrTiTaNb high-entropy alloys projectile under vacuum environment, and the impact experiment of bearing steel was carried out. The evolution process of response parameters such as flash radiation temperature, gas overpressure, flame propagation velocity and temperature rise of container wall was measured. The energy flow direction during the impact reaction of the high-entropy alloys projectile impacting the target plate was analyzed. The enthalpy of the mixed gas, the flash radiation energy, the absorption energy of the container wall, the enthalpy of the ejected gas and the deformation energy generated by the impact on the target during the impact reaction of the high-entropy alloys in a closed container were quantitatively calculated. The effects of different elements and their contents on the energy release of high-entropy alloys were obtained. The results showed that the energy released by the impact reaction of high-entropy alloys projectiles was mainly absorbed by the quasi-closed container wall. With the increase of Cu or Al content, the unit mass release energy of HfZrTiTaNb based high-entropy alloys increased. At similar impact velocities, the high-entropy alloys containing Cu released more energy per unit mass than the high-entropy alloys containing Al.