HfZrTiTaNb系高熵合金的冲击反应释能定量确定

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

作为一种新型含能材料,高熵合金在高速冲击过程中会释放大量能量,具有重要的应用价值。采用二级轻气炮系统加载真空环境下的HfZrTiTaNb系高熵合金弹丸,对轴承钢进行了冲击实验,测量了闪光辐射温度、气体超压、火焰传播速度和容器壁温升等响应参数的演化过程,分析了高熵合金弹丸撞击靶板过程中的能量流向,定量计算了高熵合金在密闭容器内冲击反应的混合气体焓、闪光辐射能、容器壁的吸收能、喷出气体焓以及撞击靶板产生的变形能,得到了不同元素及其含量对高熵合金释能量的影响。结果表明,高熵合金弹丸冲击反应释放的能量主要被准密闭容器壁吸收。随着Cu或Al含量的增加,HfZrTiTaNb系高熵合金的单位质量释能量增加。在相近的撞击速度下,含Cu高熵合金的单位质量释能量比含Al高熵合金大。

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 highentropy alloys were obtained.The results showed that the energy released by the impact reaction of highentropy 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 highentropy alloys containing Al.