Dynamic mechanical behaviour and microstructure of Al/Teflon reactive materials

Abstract

Dynamic compressive behavior of 2 kinds of Al/Teflon reactive materials samples are analyzed by using the Split Hopkinson pressure bar. The mass percentage of the samples is 26.5% Al and 73.5% Teflon. The particle size of Teflon is 30 µm, and the particle size of Al is 1.5 µm and 100 µm, respectively. The microstructure of the sample was studied by scanning electron microscope (SEM). The results show that Al/Teflon reactive materials undergoes compression-yield-unloading-enhancement stages during the process of dynamic compression. The dynamic compressive strength of Al/Teflon reactive materials samples prepared by Al_1.5 µm/Teflon_30 µm and Al_100 µm/Teflon_30 µm are 55 MPa and 47 MPa at the strain rate of 4 × 10³ s⁻¹, respectively. When the Al particle diameter is 100 µm in Al/Teflon material, the strength contribution of Al is larger. However the defect is more obvious after yield, the strength is weaker than that of Al_1.5 µm/Teflon_30 µm sample.