Effect of Plasma Electrolytic Oxidation coating on the specific strength of open-cell aluminium foams
Effect of Plasma Electrolytic Oxidation coating on the specific strength of open-cell aluminium foams
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DOI：
10.1016/j.matdes.2011.03.053
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发表时间：
2011-08-01
影响因子：
8.4
通讯作者：
Goodall, R.
中科院分区：
文献类型：
--
作者：
Abdulla, T.;Yerokhin, A.;Goodall, R.
为了提高复合材料的力学性能，对不同结构的开孔泡沫铝进行了等离子体电解氧化(PEO)涂层处理。对所制得的涂层泡沫的拉伸和压缩力学性能进行了实验评估。从实验结果可以看出，屈服应力最初随着PEO涂层厚度的增加而增加，但随着涂层厚度的增加这一趋势不再保持。这是由于更多的金属转变为陶瓷，涂层更厚(导致对缺陷更敏感的行为)，以及表层更高的缺陷密度(降低涂层材料的强度)。样品的比强度(固定体积下的单位重量屈服强度)最初随涂层厚度增加而增加，尽管由于机械效益递减和恒定重量增加，实质性涂层的影响较小。对于压缩测试的低孔率复制泡沫，最佳涂层厚度在13微米范围内；对于高孔率熔模铸造泡沫，拉伸测试的最佳涂层厚度在18~50微米之间。(C)2011爱思唯尔有限公司。保留所有权利。
Plasma Electrolytic Oxidation (PEO) coating treatment is applied to open celled aluminium foams with different structures, aiming to enhance the mechanical performance of the composite material. The mechanical properties of the coated foams produced are assessed experimentally, both in tension and compression. From experimental results, yield stress is found to increase initially with increasing PEO coating thickness, though this trend is not maintained with thicker coatings. This is caused by the transformation of greater quantities of metal to ceramic with thicker coatings (leading to more flaw-sensitive behaviour), and higher defect density in the surface layer (reducing the strength of the coating material). The specific strength of the samples (the yield strength per unit weight for a fixed volume) is shown to initially increase with coating thickness, although, due to the diminishing mechanical benefit and constant weight increase, the effect of substantial coatings is less beneficial. The optimum coating thickness appears to be in the region of 13 mu m for the low porosity replicated foams tested in compression, and a value between 18 and 50 mu m for the high porosity investment cast foams tested in tension. (C) 2011 Elsevier Ltd. All rights reserved.