泡沫铝合金阻尼性能的研究

Study on the Demping Capacity of Foamed Aluminum Alloys

本文采用渗流工艺制备具有开孔结构的泡沫工业纯铝、泡沫铝 -锌合金 (Al 2 8wt%Zn)及泡沫铝-镁合金 (Al 10wt%Mg) ,在多功能内耗仅上对这三种具有相同结构和相对密度的泡沫铝合金的阻尼性能进行了研究。实验结果表明 ,铸态下的泡沫铝 -镁合金的阻尼性能高于泡沫纯铝 ,而泡沫铝 -锌合金在室温下的阻尼性能比泡沫纯铝及泡沫铝 -镁合金高 3～ 4倍 ,分析认为泡沫铝 -锌合金的高阻尼机制主要是由于在振动时其基体中较软的α相与较硬的富锌 η相界面产生粘滞流动消耗能量的结果。

The Al-28% Zn alloy foam\,Al-10% Mg alloy foam and commercial pure aluminum with open\|cell were prepared with infiltrating process.The damping capacity of the three foams was investigated by multi\|function internal friction apparatus(MFIFA).The experimental results showed that the damping capacity of the foamed Al-10%Mg alloy was higher than that of pure aluminum in as\|cast state,however,the foamed Al-28%Zn alloy exhibited a much higher dampling capacity which is three to four times larger than those pure aluminum foams and foamed Al-10%Mg alloy around room temperature.It is believed that the mechanism for the high damping capacity of the foamed Al-28%Zn alloy resulted from the viscous sliding at the interface between the soft α phase and the brittle rich Zn phase η during vibration in the matrix.