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Gravity casting of aluminum-Al 2 O 3 hollow sphere syntactic foams for improved compressive properties
Journal of Porous Materials ( IF 2.6 ) Pub Date : 2020-05-09 , DOI: 10.1007/s10934-020-00889-x
Liwen Pan , Dewang Rao , Yiwang Yang , Junyi Qiu , Jianbo Sun , Nikhil Gupta , Zhiliu Hu

Alumina hollow spheres with a diameter range of 1–2 mm were filled in 6061 Al alloy by gravity infiltration casting to synthesize Al-matrix syntactic foams. The effects of infiltration temperature and heat treatment on microstructure, compressive properties, and energy absorption properties of the syntactic foams were studied. The results show that high quality syntactic foams could be synthesized in the infiltration temperature range 770–830 °C and the particles seamlessly bonded with the matrix. The average density and porosity of the syntactic foams were around 1.66 g/cm3 and 37.47%, respectively. The highest energy absorption capacity and specific energy absorption of the as-cast syntactic foams occurred at infiltration temperature 770 °C, reaching 41.11 MJ/m3 and 23.63 kJ/kg, respectively, while these parameters for the heat-treated samples showed the maximum values for the solution-aging treated samples, reaching 48.92 MJ/m3 and 31.36 kJ/kg respectively. Extensive literature survey is presented in this work by extracting the compressive properties of a variety of Al-matrix syntactic foams and comparing them with the results obtained in the present work. It is observed that the syntactic foams synthesized by gravity infiltration method equal or exceed the properties demonstrated by many Al-matrix syntactic foams synthesized by other methods reported in recent years. As a major advantage, the gravity infiltration method can be scaled up to industrial production level.



中文翻译:

重力铸造铝-Al 2 O 3中空球形复合泡沫以改善压缩性能

通过重力渗透铸造法将直径范围为1-2 mm的氧化铝空心球填充到6061铝合金中,以合成Al-基体复合泡沫。研究了渗透温度和热处理对复合泡沫塑料组织,压缩性能和能量吸收性能的影响。结果表明,可以在渗透温度770–830°C范围内合成高质量的复合泡沫,并且颗粒与基质无缝结合。合成泡沫的平均密度和孔隙率分别约为1.66 g / cm 3和37.47%。铸态复合泡沫的最高能量吸收容量和比能量吸收发生在渗透温度770°C时,达到41.11 MJ / m 3。和分别为23.63 kJ / kg和30.63 kJ / kg,而热处理样品的这些参数显示了固溶时效处理样品的最大值,分别达到48.92 MJ / m 3和31.36 kJ / kg。通过提取各种Al-基体复合泡沫的压缩特性并将其与本工作中获得的结果进行比较,对这项工作进行了广泛的文献调查。观察到通过重力渗透法合成的合成泡沫等于或超过近年来报道的通过其他方法合成的许多Al-基体合成泡沫所证明的性能。作为主要优点,重力渗透方法可以扩大到工业生产水平。

更新日期:2020-05-09
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