Method for improving mechanical property of foamed aluminum by dispersion strengthening

The invention relates to a method for improving the mechanical property of foamed aluminum by dispersion strengthening, in particular to a method for obviously improving the mechanical property of a foamed aluminum matrix material by using a powder metallurgic method to introduce second phase particles. Aluminum powder particles should be mixed uniformly with the second phase particles and then mixed uniformly with sodium chloride particles. The method comprises the following steps of: mechanically mixing a mixture of the aluminum powder particles and the second phase particles, the sodium chloride particles and a little amount of ethanol serving as an organic solvent uniformly; and filling the mixed powder into a mold, pressing the powder into a preformed block in a single direction by using a hydraulic machine, sintering the preformed block, naturally cooling the preformed block to room temperature, soaking the sintered blank into a water bath of between 75 and 95 DEG C for 8 to 15 hours, and thus obtaining the required second phase particle strengthened perforated aluminum-based complex foam. Compared with the perforated foam aluminum prepared by using pure aluminum powder under the same process conditions, the method has the advantage that: the yield strength of the perforated aluminum-based complex foam strengthened by adopting the second phase particles is increased by 40 to 90 percent.