首页|Exploring a balance between strength and ductility of hexagonal BN nanoplatelet reinforced ZK61 magnesium composite
Exploring a balance between strength and ductility of hexagonal BN nanoplatelet reinforced ZK61 magnesium composite
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The practical applications of magnesium(Mg)alloys are usually beset by their relatively low strength and limited ductility.Herein we attempt to fabricate hexagonal BN nanoplatelet(BNNP)reinforced ZK61 magnesium composites using a combination of spark plasma sintering and fric-tion stir processing.The resulting composites exhibit microstructural characteristics of homogeneous dispersion of BNNP in Mg matrix with re-fined equiaxed grains and(0002)basal texture roughly surrounding the pin column surface.Transmission electron microscopy observation illus-trates that trace amounts of Mg3N2 and MgB2 form at BNNP-Mg interface,in which Mg3N2 locates at the basal plane of a BNNP and MgB2 grows at its open edge.The spatial distribution of Mg3N2 and MgB2 facilitates interfacial wetting and stronger BNNP-Mg interface in such a way that interfacial products act as anchors bonding between them.In comparison with monolithic ZK61 alloy,the BNNP/ZK61 composites dis-play simultaneous improvements in yield strength,hardness and ductility,achieving good strength-ductility balance.This research is expected to shed some light on BNNP potentials for designing and producing magnesium composites with high strength and good ductility.
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