Study On Pore Structure And Mechanical Behaviors Of Porous Aluminium

In this paper, the processing methods, properties and applications of aluminium foams are briefly reviewed based on literature retrieval. The structure features, achievements on the investigation on the mechanical properties, as well as the existing problems of the porous aluminium that processed by infiltration method are introduced. The achievements on the study of aluminium foams' mechanical behaviors are recommended, and some questions are brought forward. Based on these, the present paper mainly studied the infiltration process to control the pore structure and parameters of porous aluminium, and the compressive mechanical behavior and shock wave attenuation property of the prepared porous aluminium alloys were investigated.Firstly, the porous aluminium alloys with the morphology of homogenous pore size, dual-size cell mix, and the morphology of spherical pore were prepared by infiltration process. The influences of the pore size and dual-size mix on the relative density of porous aluminium alloy were investigated. The results indicate that the relative density of porous aluminium alloy increase with the increase of the pore size, and the relative density of porous aluminium can be reduced efficiently when small cell are mixed into foams with large cells. Compared with irregular pore shape porous aluminium, the relative density of porous aluminium with spherical pore is lower.Secondly, the porous aluminium alloys with different pore size and relative density were made of ZL104 alloy, and compressive experiments have been conducted on the materials under quasi-static and dynamic loading. The stress-strain response, the influence of variation in the parameters on the mechanical behavior and the energy absorption property of porous aluminium alloy were investigated under different strain rate. The quasi-static compression results show that the compressive properties of porous aluminium alloy are not affected significantly by the variation in its pore size. While with the increase in the relative density, the mechanical properties and the energy absorption quantity increase. The dynamic compression results indicate that the porous Al-Si alloy has a significant strain-rate effect, namely the yield stress and the flow stress both rise as the increase of the strain rate. As a result, the porous aluminium absorbs more energy during compression. Additionally, the effect of the infiltration process on themicrostructure and mechanical properties of the porous Al-Si alloy matrix were also investigated. It was found that the matrix microstructure of the porous aluminium alloy is coarser, and its mechanical properties are poor compared with that of the same dense alloy.Furthermore, the present paper has studied the influence of the filled silicate rubber on the mechanical behavior of the porous aluminium. The aluminium foam containing silicate rubber was fabricated by infiltrating silicate rubber into open-cell aluminium foam. And the compressive experiments under different strain rate were conducted on the material. The experimental results indicate that the aluminium foam containing silicate rubber exhibit a much longer plateau region, and absorb more compressive energy, compared with the porous aluminium. In the strain range of 0.05~0.5, the ideal energy absorption efficiency of the aluminium foam containing silicate rubber maintains 0.6~0.7. So, it reveals an excellent energy absorbing capacity. In addition, the aluminium foam containing silicate rubber exhibits a remarkable strain rate effect as increasing the strain rate.Finally, the shock wave compression experiments were conducted on the porous aluminium. The samples' average pore size and relative density are 0.75mm and 0.33 respectively. The attenuation effect of porous aluminium to shock wave was investigated. The Hugoniot of the porous aluminium was obtained through the experiments of different impact velocities. And it was found that the porous aluminium has an excellent shock wave attenuation property.At the end of the paper, the study on pore stru...