Jamal Nur Ayuni, Tan Ai Wen, Yusof Farazila, Katsuyoshi Kondoh, Hisashi Imai, Singh S, Anuar Hazleen
Centre of Advanced Manufacturing and Materials Processing (AMMP), Faculty of Engineering, University Malaya, Kuala Lumpur 50603, Malaysia.
Department of Mechanical Engineering, Faculty of Engineering, Kuala Lumpur 50603, Malaysia.
Materials (Basel). 2016 Mar 30;9(4):254. doi: 10.3390/ma9040254.
In recent years, closed-cell porous Aluminum (Al) has drawn increasing attention, particularly in the applications requiring reduced weight and energy absorption capability such as in the automotive and aerospace industries. In the present work, porous Al with closed-cell structure was successfully fabricated by powder metallurgy technique using PMMA as a space holder. The effects of the amount of PMMA powder on the porosity, density, microstructure and compressive behaviors of the porous specimens were systematically evaluated. The results showed that closed-cell porous Al having different porosities (12%-32%) and densities (1.6478 g/cm³, 1.5125 g/cm³ and 1.305 g/cm³) could be produced by varying the amount of PMMA (20-30 wt %). Meanwhile, the compressive behavior results demonstrated that the plateau stress decreased and the energy absorption capacity increased with increasing amount of PMMA. However, the maximum energy absorption capacity was achieved in the closed-cell porous Al with the addition of 25 wt % PMMA. Therefore, fabrication of closed-cell porous Al using 25 wt % PMMA is considered as the optimal condition in the present study since the resultant closed-cell porous Al possessed good combinations of porosity, density and plateau stress, as well as energy absorption capacity.
近年来，闭孔多孔铝（Al）越来越受到关注，特别是在汽车和航空航天工业等需要减轻重量和具备能量吸收能力的应用中。在本工作中，以聚甲基丙烯酸甲酯（PMMA）作为造孔剂，采用粉末冶金技术成功制备了具有闭孔结构的多孔铝。系统评估了PMMA粉末用量对多孔试样的孔隙率、密度、微观结构和压缩行为的影响。结果表明，通过改变PMMA的用量（20 - 30 wt%），可以制备出具有不同孔隙率（12% - 32%）和密度（1.6478 g/cm³、1.5125 g/cm³和1.305 g/cm³）的闭孔多孔铝。同时，压缩行为结果表明，随着PMMA用量的增加，平台应力降低，能量吸收能力增加。然而，在添加25 wt% PMMA的闭孔多孔铝中实现了最大能量吸收能力。因此，在本研究中，使用25 wt% PMMA制备闭孔多孔铝被认为是最佳条件，因为所得的闭孔多孔铝在孔隙率、密度、平台应力以及能量吸收能力方面具有良好的组合。
