| Autor: |
Zhiqiang, Guo, Yonglin, Gong, Guoyin, Zu, Xiaoguang, Yuan, Feng, Wang, Jinwei, Li |
| Zdroj: |
International Journal of Metalcasting; 20240101, Issue: Preprints p1-16, 16p |
| Abstrakt: |
The foamed structure of the central layer, predominantly governed by the addition levels of TiH2and the composition of the precursor, in addition to the parameters associated with the foaming process, constitutes the pivotal determinant impacting the spectrum of applications for aluminum foam sandwiches. Systematic research on the foaming behavior of the AlMg4Si8matrix and pure Al matrix precursors in closed cavities with different TiH2addition levels was conducted. The results reveal that with the increasing amount of TiH2, specifically at a 200% expansion rate of AlMg4Si8foams, the number of large pores decreased, the average pore size decreased from 0.67 mm2(0.6 wt%) to 0.43 mm2(1.0 wt%), and the total number of pores increased from 125 (0.6 wt%) to 156 (1.0 wt%). This trend of pore size consistency was evident not only at the mentioned 200% expansion rate but also across different expansion rates of AlMg4Si8foams and across all expansion rates of pure Al foams. The pore structures observed in the AlMg4Si8matrix and pure aluminum matrix foams within a closed cavity exhibited significantly superior characteristics compared to those achieved through free foaming processes. The circularity of pure Al foams was mainly distributed in the range of 1–2, being higher than the AlMg4Si8foams (1–1.5) due to their low viscosity and foam stability. The compressive curve of AlMg4Si8foams at a 400% expansion rate reveals that as the average cross-sectional area increased, there was a higher likelihood of experiencing initial collapse conditions. Additionally, the fluctuation of the platform area became more pronounced. Further, the slope corresponding to the elastic stage of the compressive curve increased as the overall stress levels increased. |
| Databáze: |
Supplemental Index |
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