利用GASAR法(固-气共晶定向凝固法)制备了Al-5Cu多孔合金,研究了温度、氢气压力对孔隙率的影响。温度与饱和氢气压力的提高可以提高氢气在液态Al-5Cu合金中的溶解度,使孔隙率增加。研究了GASAR制备Al-5Cu合金中气孔的形成机理,气孔在Al-Cu共晶相中形成,并随着液相与共晶相的界面的移动而生长。此外,还对不同孔隙率的GASAR制备Al-5Cu的压缩性能进行了测试。 Al-5Cu porous alloy was prepared by GASAR method (solid-gas eutectic directional solidification method), and the influence of temperature and hydrogen pressure on porosity was studied. Increasing the temperature and the saturation hydrogen pressure can increase the hydrogen solubility in the liquid Al-5Cu alloy and increase the porosity. The formation mechanism of stomatal in Al-5Cu alloy prepared by GASAR was studied. Stomatal was formed in Al-Cu eutectic phase and grew with the interface of liquid phase and eutectic phase. In addition, the compressive properties of Al-5Cu prepared by GASAR with different porosity were also tested.