In order to investigate the energy release behavior of Al/polytetrafluoroethylene (Al/PTFE) reactive materials (RMS) more effectively, a closed chamber test system that could simultaneously examine the overpressure and the temperature is designed. The maximum overpressure with the range of 2.18–6.74 MPa and the temperature with the range of 1701–2756 K are obtained for 4–10 g RMS powder in a confined space of 8.8 l. The theoretical calculation is done for the internal energy of air (IEA), internal energy of gas product, internal energy of solid product, pressure potential energy of gas mixture (PPEGM), internal energy of chamber wall (IECW), total released energy (TRE), and specific energy (SE). The energy release events show a distinguished feature at different moments. PPEGM and IEA with a large percentage of SE are the main energy release at the beginning of the events while IECW and IEA play a more important part at the end instead, which corresponds to the energy transfer from PPEGM to IECW in essence. The maximum ratio of PPEGM and IECW to TRE is in the range of 40.76%–58.98% and 45.11%–64.56%, respectively. The obtained SE is very close to the energy content of RMS in theory, indicating that it is a competitive method to evaluate the released energy for RMS. This work is vital to understanding their damage mechanism clearly.

Although the ignition-and-growth model can simulate the ignition and detonation behavior of traditional energy materials well, it seems insufficient to simulate the impact-induced deflagration behavior of reactive materials (RMs) using current finite element codes due to their more complicated ignition threshold and lower reaction rates. Therefore, a simulation method for the impact-induced deflagration behavior of a reactive materials projectile (RMP) is developed by introducing tunable ignition threshold conditions for RMs, and a user-defined subroutine is formed by the secondary development on the equation of state (EOS). High-velocity impact experiments were performed to prove the validity of simulations. The results show that the user-defined subroutine for RMs is competent in simulating the ignition and deflagration behavior under impact conditions, because the reaction ratio, morphology and temperature distribution of RMP fragments are all well consistent with experiments, theory, and current reports from other researchers. In this way, the quantitative study on the deflagration reaction of RMs can be implemented and relevant mechanisms are revealed more clearly.

Al₈₅Ni₈Y₄Ce₃ amorphous coatings were prepared on Q235 steel by laser thermal spraying and laser remelting. The structure and thermodynamic behaviour of the coating were analysed by scanning electron microscope, energy-dispersive spectrometer, X-ray diffractometer and differential scanning calorimeter. The microhardness distribution and wear properties of the coating were investigated by microhardness tester and wear tester. The results revealed that a small number of pores and AlFeNi crystal phases presented on the surface of spraying coating, and the remelting layer presented a dense structure with a smooth surface. The volume fraction of the amorphous phase in the remelting layer was 89.9% that indicated a better glass-forming ability. The surface microhardness of the spraying coating was 754.2 HV_0.2, and the hardness of the remelted layer was 847.6 HV_0.2. After laser remelting treatment, the friction coefficient of the coating decreases by 20% and the wear resistance increases by 31%.