The picture on the left is a pure metal sample, and the picture on the right is a newly developed new metal material consisting of magnesium and silicon carbide nanoparticles, each center cylinder approximately 4 microns in diameter.
The new metal is a magnesium metal that incorporates densely dispersed nano-SiC particles that can be used in light aircraft, spacecraft and automobiles to help improve fuel efficiency while also being used in mobile electronics and biomedical device manufacturing. It is reported that in order to manufacture ultra-high-strength, light-weight metal materials, the research team found a new method to disperse and stabilize nanoparticles in molten metal materials. At the same time, they also developed a scalable manufacturing method for manufacturing more. Lightweight metal with high performance. Currently, this latest research report is published in the recently published journal Nature.
Li Xiaochun, the head of the research project, and Raytheon Chair, a division of manufacturing engineering at the University of California, Los Angeles, pointed out that nanoparticles can actually increase the strength of metals without damaging their plasticity, especially like magnesium. Such light weight metals, but so far no research group has been able to disperse ceramic nanoparticles in molten metal. Based on the infusion of physical properties and material processing, we finally improved the metal properties by infusing dense nanoparticles to enhance metal properties.
Structural metal is a load-bearing metal used in construction and automotive manufacturing. Magnesium is only two-thirds of the density of aluminum and is the lightest structural metal. Silicon carbide is a superhard ceramic material commonly used in the manufacture of industrial blades. Currently, this latest technology injects a large amount of silicon carbide particles (less than 100 nanometers in diameter) into the molten magnesium metal, which significantly improves the strength, stiffness, plasticity and durability of the metal at high temperatures.
For a long time, scientists believe that ceramic particles can potentially make metals harder, whereas microscopic ceramic particles lose plasticity during infusion. In contrast, nanoscale particles can significantly increase strength or increase metal plasticity, but nanoceramic particles tend to condense together rather than uniformly dispersed because small particles tend to attract each other. In order to eliminate this problem, the researchers dispersed the nanoparticles in the molten magnesium-zinc alloy, which relied on the kinetic energy of the particle motion to disperse from each other, which stabilized the uniform dispersion of the nanoparticles and avoided cohesion.
To further enhance the strength of this new metal material, the researchers used a technique called high-pressure torsion for compression. At present, 14% of this new metal material is silicon carbide nanoparticles, and 86% is magnesium-zinc alloy.
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