稀土对泡沫锌铝合金组织和阻尼性能的影响

利用负压渗流法制备出稀土泡沫锌铝合金,研究稀土La和Ce的添加量对泡沫锌铝合金组织和阻尼性能的影响。结果表明：在泡沫锌铝合金中加入Al-10?或Al-10%La中间合金细化了组织,同时提高了泡沫锌铝合金的阻尼能力;稀土元素的添加量为0.3%时（质量分数）可获得最佳的变质效果和最高的阻尼能力;相对于未变质而言,阻尼能力提高了近3倍;稀土泡沫锌铝合金的阻尼机制与相界面的非弹性粘滞性流动有关,合金的相界面越多,阻尼性能就越好。

Influence of rare earths on microstructure and damping capacity of ZA alloy foam

Zn-22%Al foamed alloys with rare earth La or Ce additives were fabricated by the vacuum infiltration casting, the effects of La and Ce on the modification of microstructure and damping capacity of Zn-22%Al alloy foam were investigated. The results show that the addition of Al-10? and Al-10%La master alloy into the Zn-22%Al alloy foam can refine microstructure and improve the damping capacity. The best modification effect and the highest damping capacity can be obtained by the addition of 0.3%RE. The damping mechanism of Zn-22%Al alloy foam is associated with the non-elastic viscous flow of interfaces, and the more the interfaces, the higher the damping capacity of Zn-22%Al alloy foam.