Foamability and mechanical properties of in situ submicron MgAl2O4p/Al composite foams by ultrasonic method

摘要

? 2022 Elsevier B.V.Composite aluminum foams, which are reinforced with submicron MgAl2O4 generated in situ using different weight percentages of SiO2 precursor (0.3, 0.5, and 0.7 wt), were fabricated by stir casting and ultrasonic treatment (UT). Experimental results indicated that the microstructural constitution of all the foams prepared was composed of α-Al, MgAl2O4 and Fe based intermetallics. More uniform pore distribution and better stability were achieved in the foams corresponding to maximum SiO2 addition. The mechanical properties of the MgAl2O4p/Al composite foams were investigated by the quasi-static compression test. The plateau stress and energy absorption are enhanced with increasing SiO2 addition. These are mainly due to the presence of submicron particles in the microstructure.