Abstract
The closed-cell micro-pore magnesium composite foam with hollow ceramic microspheres (CMs) was fabricated by a modified melt foaming method. The effect of CMs on the compressive deformation behavior of CM-containing magnesium composite foam was investigated. Optical microscopy and scanning electron microscopy were used for observation of the microstructure. Finite element modeling of the magnesium composite foam was established to predict localized stress, fracture of CMs, and the compressive deformation behavior of the foam. The results showed that CMs and pores directly affected the compressive deformation behavior of the magnesium composite foam by sharing a part of load applied on the foam. Meanwhile, the presence of Mg2Si phase influenced the mechanical properties of the foam by acting as the crack source during the compression process.
Highlights
Metal matrix syntactic foams (MMSF) are a novel class of materials which possess excellent mechanical properties compared to traditional metal foams, e.g., high strength-to-weight ratio, high specific stiffness, excellent thermal insulation, and low thermal expansion coefficient [1,2,3,4].metal matrix syntactic foams are candidates for weight-sensitive applications in transport, ship engineering, aerospace, and construction fields [5,6,7]
Closed-cell magnesium composite foam is a kind of newly-developed metal foam, which contains a certain quantity of hollow ceramic microspheres (CMs, a by-product of coal combustion in thermal power plants)
Santa Maria et al discussed the effect of hollow sphere dimensions and volume fractions on the compressive property of aluminum matrix syntactic foam and the results showed that the peak strength, plateau strength, and toughness of the foam increased with decreasing hollow sphere wall thickness to diameter (t/D) ratio [24]
Summary
Metal matrix syntactic foams (MMSF) are a novel class of materials which possess excellent mechanical properties compared to traditional metal foams, e.g., high strength-to-weight ratio, high specific stiffness, excellent thermal insulation, and low thermal expansion coefficient [1,2,3,4]. Metal matrix syntactic foams are candidates for weight-sensitive applications in transport, ship engineering, aerospace, and construction fields [5,6,7]. Closed-cell magnesium composite foam is a kind of newly-developed metal foam, which contains a certain quantity of hollow ceramic microspheres (CMs, a by-product of coal combustion in thermal power plants). Magnesium composite foam has been drawing much attention in construction, automotive, and aerospace applications from the viewpoint of environmental preservation due to its unique combination of thermal, physical, acoustic, mechanical, and electrical properties [14,15,16]
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