Movahedi Nima, Murch Graeme E, Belova Irina V, Fiedler Thomas
Centre for Mass and Thermal Transport in Engineering Materials, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia.
Materials (Basel). 2019 Mar 7;12(5):792. doi: 10.3390/ma12050792.
Zinc alloy (ZA27) syntactic foams (SF) were manufactured using expanded perlite (EP) particles and counter-gravity infiltration casting. Due to a variation of the metallic matrix content, the density of the produced foam samples varied from 1.78 to 2.03 g·cm. As-cast and solution heat-treated samples were tested to investigate the compressive properties of the ZA27 syntactic foam. To this end, quasi-static compression tests were conducted. In addition, microstructural analysis of the as-cast and heat-treated syntactic foams was carried out using scanning electron microscopy. The results indicate that the heat treatment alters the microstructure of the ZA27 alloy matrix from a multiphase dendrite to a spheroidized microstructure with improved ductility. Moreover, the heat treatment considerably enhances the energy absorption and plateau stress ( σ pl ) of the syntactic foam. Optical analysis of the syntactic foams under compression shows that the dominant deformation mechanism of the as-cast foams is brittle fracture. In comparison, the heat-treated samples undergo a more ductile deformation.
采用膨胀珍珠岩（EP）颗粒和反重力渗透铸造法制备了锌合金（ZA27）复合泡沫材料（SF）。由于金属基体含量的变化，所制备泡沫样品的密度在1.78至2.03 g·cm之间变化。对铸态和固溶热处理后的样品进行测试，以研究ZA27复合泡沫材料的压缩性能。为此，进行了准静态压缩试验。此外，使用扫描电子显微镜对铸态和热处理后的复合泡沫材料进行了微观结构分析。结果表明，热处理使ZA27合金基体的微观结构从多相枝晶转变为具有改善延展性的球化微观结构。此外，热处理显著提高了复合泡沫材料的能量吸收和平台应力（σpl）。对压缩状态下的复合泡沫材料进行光学分析表明，铸态泡沫的主要变形机制是脆性断裂。相比之下，热处理后的样品发生更具延展性的变形。
