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

Materials

Yoshihiko Hangai¹  Takao Utsunomiya⁵  Osamu Kuwazuru³  Soichiro Kitahara⁶  Nobuhiro Yoshikawa⁴  Sven De Schampheleire²  Dirk Lehmhus²  Matej Vesenjak² 

[1] Graduate School of Science and Technology, Gunma University, Kiryuu 376-8515, Japan;id="af1-materials-08-05366">1Graduate School of Science and Technology, Gunma University, Kiryuu 376-8515, JapGraduate School of Engineering, University of Fukui, Fukui 910-8507, Japan;Institute of Industrial Science, the University of Tokyo, Tokyo 153-8505, Japan;Faculty of Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan;Hokudai Co., Ltd., Abira 059-1434, Japan;

关键词: cellular materials;    functionally graded materials;    friction stir processing;    pore structure;    porosity;    aluminum alloy die casting;    foam;   

DOI  :  10.3390/ma8105366

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
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