U.S. scientists develop high-strength, ultra-light metallic materials that improve fuel efficiency

The left picture shows a pure metal sample, and the right figure shows a newly developed new metal material consisting of magnesium and silicon carbide nanoparticles, each of which is approximately 4 microns in diameter.

According to foreign media reports, at present, the research group of the University of California, Los Angeles has recently developed an ultra-high-strength, very light metallic material. They use a new method to disperse and stabilize the magnesium nanoparticles into the molten state.

This new type of metal material is magnesium metal added to densely dispersed nano-silicon carbide particles. It can be used in the manufacture of light aircrafts, spacecrafts, and automobiles, helping to improve fuel efficiency. It can also be used in mobile electronics and biomedical equipment manufacturing.

It is reported that in order to manufacture ultrahigh-strength, light-weight metallic materials, the team discovered 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. High performance light weight metal. At present, this latest research report is published in the recently published "Nature" magazine.

Li Xiaochun, head of the research project, and Raytheon Chair of the Department of Manufacturing Engineering at the University of California, Los Angeles, pointed out that nanoparticles can actually improve metal strength without damaging its plasticity, especially like magnesium. Such lightweight metals, but so far no research team has been able to disperse ceramic nanoparticles in the molten metal.

Based on the infusion of physical properties and the material processing process, we finally improved metal properties by infusing dense nanoparticles, confirming a new approach to enhance metal performance.

Structural metal is a carrier metal that is 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 that is commonly used in the manufacture of industrial blades.

Currently, this latest technology infused a large amount of silicon carbide particles (diameter less than 100 nanometers) into the molten state of the magnesium metal, thereby significantly increasing 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, nano-sized particles can significantly increase strength or enhance metal plasticity, but nano-ceramic particles tend to agglomerate rather than disperse uniformly, because small particles tend to attract each other.

To eliminate this problem, the researchers dispersed the nanoparticles in a molten magnesium-zinc alloy. They depended on the kinetic energy of the particles to disperse one another, which would stabilize the uniform dispersion of the nanoparticles and avoid coagulation.

To further enhance the strength of this new metal material, researchers use a technique called high-pressure torsion technology for compression. At present, 14% of this new metal material is silicon carbide nanoparticles and 86% is a magnesium-zinc alloy.

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