Abstract
This work introduces Mg-4Zn-3Gd-1Ca/2ZnO (wt.%) nanocomposite fabricated using the technique of disintegrated melt deposition and extrusion. Addition of ZnO nanoparticles enhanced the compressive strengths of alloy by ~100 MPa. Nanocomposite samples display high strength and good ductility: 0.2% compressive yield stress of 355 MPa, ultimate compressive stress of 703 MPa, and compressive failure strain of 10.6%. The significant enhancement of compressive yield stress is mainly attributed to the grain refinement by adding nanoparticles. The strength levels exceed that of commercial magnesium alloys (i.e. WE43, WE54, ZK60, and ME21) and mild steels (i.e. S275 and S355), making Mg-4Zn-3Gd-1Ca/2ZnO a very promising material for multiple engineering and biomedical applications.
Highlights
Magnesium is the lightest structural metal – only two thirds the density of aluminum
It is evident that with a comparable elongation, the nanocomposite Mg4Zn3Gd1Ca-2ZnO exhibits significant higher strength than other extruded Mg alloys shown in Fig. 2, and the compressive yield strength levels either matches or surpasses that of mild steel
All materials in the figure were fabricated by disintegrated melt deposition (DMD) method and extruded with the same extrusion ratio (20.25:1)
Summary
Magnesium is the lightest structural metal – only two thirds the density of aluminum. Rolled Mg-1Zn-Gd (2 and 3 wt.% for Gd) sheet studied by Wu et al.[3] displayed a high tensile failure strain (~50%) as a result of texture weakening by adding Gd. Addition of Ca element into Mg alloys can improve strength effectively through grain refinement. Addition of nano-size reinforcements to Mg alloys is another effective way to improve the mechanical properties beyond that of alloying elements. Studies by Nguyen et al.[8] and Chen et al.[9] demonstrated that addition of Al2O3 nanoparticles into AZ31 improved tensile ductility and strength simultaneously, while the compressive strength was enhanced. The present study investigates the effect of addition of ZnO nanoparticles in a new Mg-Zn-Gd-Ca alloy emphasizing on the compressive response
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