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Materials 2014, 7(9), 6796-6810; doi:10.3390/ma7096796

Fabrication of Aluminum Foam-Filled Thin-Wall Steel Tube by Friction Welding and Its Compression Properties

1
Graduate School of Engineering, Gunma University, Kiryu 376-8515, Japan
2
SIT Research Laboratories, Shibaura Institute of Technology, Saitama 337-8570, Japan
3
Hokudai Co., Ltd., Abira 059-1434, Japan
4
Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan
5
Institute of Industrial Science, the University of Tokyo, Tokyo 153-8505, Japan
*
Author to whom correspondence should be addressed.
Received: 18 July 2014 / Revised: 25 August 2014 / Accepted: 16 September 2014 / Published: 19 September 2014
(This article belongs to the Section Porous Materials)
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Abstract

Aluminum foam has received considerable attention in various fields and is expected to be used as an engineering material owing to its high energy absorption properties and light weight. To improve the mechanical properties of aluminum foam, combining it with dense tubes, such as aluminum foam-filled tubes, was considered necessary. In this study, an aluminum foam-filled steel tube, which consisted of ADC12 aluminum foam and a thin-wall steel tube, was successfully fabricated by friction welding. It was shown that a diffusion bonding layer with a thickness of approximately 10 μm was formed, indicating that strong bonding between the aluminum foam and the steel tube was realized. By the X-ray computed tomography observation of pore structures, the fabrication of an aluminum foam-filled tube with almost uniform pore structures over the entire specimen was confirmed. In addition, it was confirmed that the aluminum foam-filled steel tube exhibited mechanical properties superior to those of the ADC12 aluminum foam and steel tube. This is considered to be attributed to the combination of the aluminum foam and steel tube, which particularly prevents the brittle fracture and collapse of the ADC12 foam by the steel tube, along with the strong metal bonding between the aluminum foam and the steel tube. View Full-Text
Keywords: cellular materials; composites; foam; friction welding; die casting; X-ray computed tomography (CT) cellular materials; composites; foam; friction welding; die casting; X-ray computed tomography (CT)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Hangai, Y.; Saito, M.; Utsunomiya, T.; Kitahara, S.; Kuwazuru, O.; Yoshikawa, N. Fabrication of Aluminum Foam-Filled Thin-Wall Steel Tube by Friction Welding and Its Compression Properties. Materials 2014, 7, 6796-6810.

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