Evolution of Morphology of the Foam Aluminum in the Foaming Process by the Powder Metallurgy Method

The process of preparation foam aluminum by powder metallurgy method was studied. Effect of foaming time on the density and porosity of foam aluminum was discussed in detail. Evolution of pores in the foaming process was described, and the foaming mechanism was analysed. In foaming course, with time increase at the initial stage, the pressure of hydrogen as the expanding drive increases and the bubbles grow. Pores collapse due to growing excessively at certain hydrogen pressure.