Effect of TiH2 on preparation of closed-cell aluminum foam and its compressive behavior
(1.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
2.辽宁省沈阳市东北大学材料与冶金学院)
2.辽宁省沈阳市东北大学材料与冶金学院)
Abstract: The vesicant problem during the process of preparing closed-cell aluminum foam by molten body transitional foaming process was discussed and the effect of granularity and addition of TiH2 on porosity of closed-cell aluminum foam was investigated. The static compressive behavior of closed-cell aluminum foam and the influence of porosity on static compressive property of closed-cell aluminum foam were researched as well. The results show that with increasing granularity of TiH2, the porosity of closed-cell aluminum foam firstly increases and then decreases gradually, the granularity should be controlled in the range of 38?74 μm which can result in higher porosity. The porosity of closed-cell aluminum foam increases with the increasing addition of TiH2, and the addition of TiH2 should be controlled from 1.5% to 2.5% which can result in homogeneous cell and moderate strength of closed-cell aluminum foam. The compressive process of closed-cell aluminum foam obviously displays linear elastic phase, plastic collapse phase, and densification phase, and the compressive strength grows with decreasing porosity.
Key words: TiH2; closed-cell aluminum foam; granularity; porosity; mechanical behavior