Bubble Nucleation of PM Al-9Si Foam

Abstract:

Being the first step of foaming, bubble heterogeneous nucleation of aluminum foam has remarkable effects on the final cell structure of aluminum foam. The bubble heterogeneous nucleation of foaming Al-9Si and T_iH₂ powder compact has been analyzed. The results obtained are given as follows: (1)The remaining T_iH₂ particles act as the nuclei during heterogeneous nucleation. (2)The nucleation rate increases with the increasing of T_iH₂ content, the decrease of T_iH₂ granularity, the elevation of foaming temperature, and the elongation of foaming time. (3) Only about 5‰ bubble nuclei can survive and develop to the final foam cells. (4)The influence of processing parameters on the nucleation rate descends by the following sequence: foaming temperature elevates 20°C, T_iH₂ granularity decreases from 150μm to 26μm, T_iH₂ content increases 0.5%wt., and the time for foaming extends 10s.

• Periodical: Advanced Materials Research (Volumes 183-185)
• Pages: 1682-1686
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.183-185.1682
• Online since: January 2011
• Authors: Ying Wu Wang, Xiao Qing Zuo, Jian Sheng Lu, Yun Zhou
• Keywords: Al-9Si Foam, Bubble Nucleation, Nucleation Rate, PM, TiH₂

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