Synthesis and characterisation of floatable magnesium alloy syntactic foams with hybridised cell morphology

Akinwekomi, Akeem Damilola and Tang, Chak Yin and Tsui, Gary Chi Pong and Law, Wing Cheung and Chen, Ling and Yang, Xu Sheng and Abd Shukor, Mohd Hamdi (2018) Synthesis and characterisation of floatable magnesium alloy syntactic foams with hybridised cell morphology. Materials & Design, 160. pp. 591-600. ISSN 0261-3069, DOI

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Powder metallurgy and rapid microwave (MW) sintering techniques were successfully applied to engineer a hybrid cell structure into magnesium alloy AZ61 syntactic foams. The hybrid cell structure, comprising open- and closed-cells, originated from leached carbamide granules and hollow microspheres of fly ash (HS), respectively. External MW susceptors accelerated the sintering process and greatly mitigated the formation of undesirable interfacial reactions. The cell hybridisation technique facilitated control over the density and strength of the syntactic foams. Accordingly, floatable syntactic foams with a density of about 0.79 g/cm3 and compressive strength of 16 MPa were synthesised without recourse to any surface modification or chemically-induced superhydrophobicity. The processing techniques were capable of mitigating damage to the HS microspheres as confirmed by microstructural examinations. Furthermore, potential applications of the floatable syntactic foam sample, as a microboat and chemical release agent, were demonstrated by using ethanol as a propellant. AZ61 syntactic foams synthesised in this study exhibited low density and adequate strength, suggesting their applicability as alternative materials to polymer composite foams.

Item Type: Article
Uncontrolled Keywords: Magnesium alloy; Powder metallurgy; Microwave sintering; Mechanical properties; Syntactic foam; Hybrid cells
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 27 Sep 2019 02:26
Last Modified: 01 Oct 2021 03:42

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