Pore Structure and Deformation Correlation of an Aluminum Foam Sandwich Subject to Three-Point Bending

被引:0
|
作者
Lu, Xiaotong [1 ]
Jing, Lei [1 ]
Zhou, Wenhao [1 ]
Yang, Hui [1 ]
Yuan, Pingyun [1 ]
Li, Xiaocheng [1 ]
机构
[1] Northwest Inst Nonferrous Met Res, China Shaanxi Key Lab Biomed Met Mat, Xian 710016, Peoples R China
基金
芬兰科学院;
关键词
aluminum foam sandwich; melt foaming; hot rolling; pore structure; three-bending test; CORE; PANELS; BEHAVIOR; FABRICATION; BEAMS; INDENTATION; MECHANISMS; MAGNESIUM;
D O I
10.3390/ma17030567
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An Al-Si matrix foam sandwich (AFS) with 6063 Al alloy cover sheets was fabricated by hot rolling combined with melt foaming. A foamable AlSiMg1/SiCp matrix precursor was prepared by the melting route. Hot rolling at 480 degrees C was carried out to obtain a mechanical bonding interface between the cover sheet and the foamable precursor. Meanwhile, the pore structure of the AFS was deeply affected by the foaming temperature and foaming time during the foaming process. Different pore growth mechanics of the crack-like pore disappearance mechanism (CDM) and pore active expansion mechanism (AEM) were concluded based on the pressure difference in pores inside and outside. Three bending tests were applied to three types of AFSs with different pore structures to evaluate the relation between pore structures and AFS mechanical properties. The bending property of the AFS with fewer layers of pores is like that of a dense material. The bending property of the AFS with a pore size in the range of 0 similar to 1 mm presents a typical sandwich shear failure mode. The AFS with a uniform pore structure, in which the shapes of the pores are predominately polygons and the pore diameter is concentrated in the range of 0.5 similar to 3 mm, processes a good energy absorption capacity, and the bending stress-strain curve fluctuates greatly after the first stress drop.
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页数:18
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