Abstract
The microstructure and quasi-static compressive mechanical properties of Al-A206/Al2O3 hollow sphere syntactic foams were investigated for foams with three different hollow sphere size ranges (0.106–0.212mm, 0.212–0.425mm, 0.425–0.500mm) and three different conditions including As cast (F), T4 and T7. The peak strength, plateau strength and toughness of the foams were found to increase with increasing wall thickness to diameter (t/D) ratio. Since the t/D ratio was found to increase with decreasing sphere diameter, the foams produced with the smallest hollow spheres (0.106–0.212mm) showed superior performance for the peak strength (F: 226MPa, T4: 312MPa, T7: 342MPa), plateau strength (F: 190MPa, T4: 269MPa, T7: 269MPa), and toughness (F: 59J/cm3, T4: 78J/cm3, T7: 88J/cm3). These properties were also found to generally increase with increasing matrix yield strength. The 0.212–0.425mm T7 heat treated syntactic foams in this study exhibit the highest specific plateau strength (102MPa-cm3/g) and the second highest specific energy absorption (41J/g) of aluminum syntactic foams reported in literature for which comparable data is available.
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