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Materials 2015, 8(10), 7161-7168; doi:10.3390/ma8105366

Deformation and Plateau Region of Functionally Graded Aluminum Foam by Amount Combinations of Added Blowing Agent

1
Graduate School of Science and Technology, Gunma University, Kiryuu 376-8515, Japan
2
Faculty of Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan
3
Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan
4
Hokudai Co., Ltd., Abira 059-1434, Japan
5
Institute of Industrial Science, the University of Tokyo, Tokyo 153-8505, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Sven De Schampheleire, Dirk Lehmhus, Matej Vesenjak and Thomas Fiedler
Received: 2 August 2015 / Revised: 22 September 2015 / Accepted: 6 October 2015 / Published: 21 October 2015
(This article belongs to the Special Issue Metal Foams: Synthesis, Characterization and Applications)
View Full-Text   |   Download PDF [2916 KB, uploaded 21 October 2015]   |  

Abstract

Recently, to further improve the performance of aluminum foam, functionally graded (FG) aluminum foams, whose pore structure varies with their position, have been developed. In this study, three types of FG aluminum foam of aluminum alloy die casting ADC12 with combinations of two different amounts of added blowing agent titanium(II) hydride (TiH2) powder were fabricated by a friction stir welding (FSW) route precursor foaming method. The combinations of 1.0–0 mass %, 0.4–0 mass %, and 0.2–0 mass % TiH2 were selected as the amounts of TiH2 relative to the mass of the volume stirred by FSW. The static compression tests of the fabricated FG aluminum foams were carried out. The deformation and fracture of FG aluminum foams fundamentally started in the high-porosity (with TiH2 addition) layer and shifted to the low-porosity (without TiH2 addition) layer. The first and second plateau regions in the relationship between compressive stress and strain independently appeared with the occurrence of deformations and fractures in the high- and low-porosity layers. It was shown that FG aluminum foams, whose plateau region varies in steps by the combination of amounts of added TiH2 (i.e., the combination of pore structures), can be fabricated. View Full-Text
Keywords: cellular materials; functionally graded materials; friction stir processing; pore structure; porosity; aluminum alloy die casting; foam cellular materials; functionally graded materials; friction stir processing; pore structure; porosity; aluminum alloy die casting; foam
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hangai, Y.; Utsunomiya, T.; Kuwazuru, O.; Kitahara, S.; Yoshikawa, N. Deformation and Plateau Region of Functionally Graded Aluminum Foam by Amount Combinations of Added Blowing Agent. Materials 2015, 8, 7161-7168.

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