Abstract
Fe–Al energetic material releases a large amount of energy under impact loading; therefore, it can replace traditional materials and be used in new weapons. This paper introduces the macroscopic experiment and microscopic molecular-dynamics simulation research on the energy release characteristics of Fe–Al energetic jets under impact loading. A macroscopic dynamic energy acquisition test system was established to quantitatively obtain the composition of Fe–Al energetic jet reaction products. A momentum mirror impacting the Fe–Al particle molecular model was established and the microstructure evolution and impact thermodynamic response of Fe–Al particles under impact loading were analyzed. The mechanism of multi-scale shock-induced chemical reaction of Fe–Al energetic jets is discussed. The results show that the difference in velocity between Fe and Al atoms at the shock wave fronts is the cause of the shock-induced reaction; when the impact strength is low, the Al particles are disordered and amorphous, while the Fe particles remain in their original state and only the oxidation reaction of Al and a small amount intermetallic compound reaction occur. With the increase of impact strength, Al particles and Fe particles are completely disordered and amorphized in a high-temperature and high-pressure environment, fully mixed and penetrated. The temperature of the system rises rapidly, due to a violent thermite reaction, and the energy released by the jet shows an increasing trend; there is an impact intensity threshold, so that the jet release energy reaches the upper limit.
Highlights
The large amounts of energy released by energetic materials enables the replacement of conventional materials in new types of weapons [1,2,3]
This study aims to fill the gap in research on the energy release mechanism of Fe–Al energetic materials when applied to jets
The Fe–Al energetic jet-dynamic energy-acquisition test system was designed and the impact energy release characteristics of the Fe–Al energetic jet were studied by experimental means
Summary
The large amounts of energy released by energetic materials enables the replacement of conventional materials in new types of weapons [1,2,3]. Of the Fe–Al composite energetic material attract an increasing number of researchers [4,5,6,7]. Al phase to react violently, releasing a large amount of energy. Applying this energetic material to the liner can form an energetic jet and greatly increase the damage power [8]. Substantial progress had been made in the field of preparation and impact deformation of Fe–Al energetic composite materials. Du et al [9] coated nano Al powder based on the chemical liquid deposition method and chemical vapor deposition method and prepared a new type of metal Fe/Alp composite powder, which improved the stability and energy release efficiency of nano Al powder. Airiskallio et al [10] experimentally determined that Fe–Al intermetallic compounds have outstanding antioxidant properties
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