Mechanical properties and damping properties of carbon nanotube-reinforced foam aluminum with small aperture
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Mechanical properties and damping properties of carbon nanotube-reinforced foam aluminum with small aperture Mingying Chen1,b), Bowen Liu2,b), Zhen Ji1,a), Chengchang Jia2, Qiuchi Wu1, Zhe Liu1 1
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China a) Address all correspondence to this author. e-mail: [email protected] b) These authors contributed equal 2
Received: 30 October 2019; accepted: 13 May 2020
In this paper, CNTs reinforced foam aluminum matrix composites with small pore diameter were prepared by powder metallurgy method. When the mass fraction of CNTs was 0.75%, the tensile strength, flexural strength and compressive yield strength of the materials were 3.4 times, 2.4 times and 2.4 times of pure foam aluminum, respectively, reaching the maximum value, which obviously improved the mechanical properties of aluminum foam. The tensile property model of foam aluminum matrix composites was built to predict the properties of the composites, and the effects of defects and reinforcement on the mechanical properties of the composites were compared. The results show that the tensile fitting is consistent with the measured results when the mass fraction of CNTs is less than 0.75%, but the weakening effect of defects on the strength of aluminum foam is much greater than the enhancement of CNTs. With the increase of CNTs mass fraction, the damping loss factor of foam aluminum composites increases, dislocation damping and grain boundary damping play a role in advance, and the damping peak moves to the low temperature region.
INTRODUCTION As a solid material of foam metal, foam aluminum has both physical and chemical properties of the matrix materials and due to its three-dimensional pore characteristics, it has better physical properties than solid metal materials. The most obvious feature of aluminum foam is low density, so it be used as an ideal lightweight material. At the same time, aluminum foam also has high specific surface area, oxidation resistance, low thermal conductivity, good damping, sound and energy absorption, and good electromagnetic shielding properties. Therefore, it is widely used in the fields of automobile and shipbuilding, aerospace materials, electronic equipment, and chemical industry [1, 2]. Among the methods for preparing foamed aluminum, melt foaming, electrodeposition, and powder metallurgy methods are common. Unlike other preparation methods, the powder metallurgy method is widely used for the preparation of aluminum form with the advantages of a simple preparation process, short preparation cycle, and good porosity controllability. However, no matter which method is used to prepare the aluminum foam, it has defects with higher density on the pore walls. Due to the defects, the mechanical properties of the aluminum foam are very low, which greatly limits its
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