“…As a result of the ability for Mg to form its oxide eight times higher than that of Al at any temperature, it is believed that MgO is formed immediately at the reinforcement/Mg interface during the fabrication process of the composite. 5,20 It is similar to other Mg matrix composites reinforced with carbon fibers and oxide fibers where the MgO interfacial layer is usually observed. 6,21 – 24 Figure 4.Transmission electron microscope (TEM) micrographs of magnesium borate whisker (Mg 2 B 2 O 5 w) in the preform sintered for 3 h at 850°C in air.…”
The microstructure, mechanical properties and fracture behavior of AZ91D magnesium matrix composite reinforced with magnesium borate whisker fabricated by squeeze casting technique were investigated. The results indicate that magnesium borate whisker can improve the mechanical properties of AZ91D alloy significantly. Transmission electron microscope observation shows that a continuous magnesium oxide interfacial layer of about 25 nm thick is formed at the magnesium borate whisker/matrix interface, which is formed from the interfacial reaction between the liquid Mg and oxygen absorbed at the surface of magnesium borate whisker. The magnesium oxide interfacial layer can act as a barrier layer to prevent the further reaction between magnesium borate whisker and the liquid Mg, and may play an important role in the improvement of the mechanical properties of the composite.
“…As a result of the ability for Mg to form its oxide eight times higher than that of Al at any temperature, it is believed that MgO is formed immediately at the reinforcement/Mg interface during the fabrication process of the composite. 5,20 It is similar to other Mg matrix composites reinforced with carbon fibers and oxide fibers where the MgO interfacial layer is usually observed. 6,21 – 24 Figure 4.Transmission electron microscope (TEM) micrographs of magnesium borate whisker (Mg 2 B 2 O 5 w) in the preform sintered for 3 h at 850°C in air.…”
The microstructure, mechanical properties and fracture behavior of AZ91D magnesium matrix composite reinforced with magnesium borate whisker fabricated by squeeze casting technique were investigated. The results indicate that magnesium borate whisker can improve the mechanical properties of AZ91D alloy significantly. Transmission electron microscope observation shows that a continuous magnesium oxide interfacial layer of about 25 nm thick is formed at the magnesium borate whisker/matrix interface, which is formed from the interfacial reaction between the liquid Mg and oxygen absorbed at the surface of magnesium borate whisker. The magnesium oxide interfacial layer can act as a barrier layer to prevent the further reaction between magnesium borate whisker and the liquid Mg, and may play an important role in the improvement of the mechanical properties of the composite.
“…Understanding the interfacial structure and behavior of the reinforcement and matrix in magnesium matrix composites is of great importance, because this region controls the efficiency of load transfer from matrix to reinforcement [42]. In this section, the interfacial features in some common magnesium matrix composites will be discussed in order to get insight into the nature of magnesium matrix composites.…”
In the last two decades, lightweight magnesium matrix composites have been the hot issue of material field due to their excellent mechanical and physical properties, e.g., high-specific strength and modulus, good wear resistance, and damping capacity. As compared with aluminum matrix composites, magnesium matrix composites have merit in their specific weight and have wide applications in aerospace and aeronautical fields. Generally, the processing techniques for magnesium matrix composites can be categorized as conventional and special processing routes. In recent years, as a special processing route, metal melt infiltration into porous ceramic preform featured by its low cost and availability of high-volume fraction of reinforced ceramics have been receiving much attention. Thus, in this review, one emphasis was put on the description of this processing technique in association with the means to obtain good wettability, the prerequisite for this kind of processing method. Based on the recognized fact that there exist clean interface and bonding ability between ceramics and matrix metal, in-situ reaction synthesis is usually utilized to fabricate magnesium matrix composites. Therefore, the interfacial feature was also reviewed for the in-situ reaction synthesis. Characterizations of microstructures and various mechanical-physical properties were finally summarized for magnesium matrix composites including tensile response, wear resistance, creep behavior, and damping capacity.
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