In this study, the stir casting method was used to prepare aluminum matrix bimodal syntactic foams by mixing alumina hollow spheres of different size ranges. Alumina hollow spheres of 1.0–4.0 mm were divided into six size ranges. In bimodal syntactic foams, the hollow spheres of different size ranges were mixed in equal volume to ensure that their average diameter was almost the same, or the hollow spheres of 1.5–2.0 mm and 3.0–3.5 mm were mixed in different volume ratios. The bimodal syntactic foams under quasi-static compression first fractured along the small-sized hollow spheres, presenting brittle fracture characteristics. When mixing hollow spheres with different size ranges in equal volume, the mechanical properties of bimodal syntactic foams strongly depended on the average diameter of hollow spheres. The mechanical properties of bimodal syntactic foams with 1.5–2.0 mm and 3.0–3.5 mm hollow spheres decreased linearly with the increase of 3.0–3.5 mm hollow sphere content.

在本研究中，通过混合不同尺寸范围的氧化铝空心球，采用搅拌浇铸法制备铝基双峰复合泡沫材料。1.0-4.0 毫米的氧化铝空心球分为六个尺寸范围。在双峰复合泡沫中，将不同尺寸范围的空心球等体积混合以确保它们的平均直径几乎相同，或者将1.5-2.0 mm和3.0-3.5 mm的空心球以不同的体积比混合。准静态压缩下的双峰复合泡沫首先沿小尺寸空心球断裂，呈现脆性断裂特征。在等体积混合不同尺寸范围的空心球时，双峰复合泡沫的力学性能强烈依赖于空心球的平均直径。