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Nanotechnology Makes Special Aluminum Alloys Weldable And Can Be Used In Automobile Manufacturing And Other Fields

wallpapers News 2020-11-12
Titanium aluminum carbide is one of a series of ternary layered carbides with the main component of titanium aluminum carbide compound (Ti3AlC2) discovered in the 1880s and 1990s. It has high strength and elastic modulus, high thermal conductivity and electrical conductivity, and good workability.

According to a recent report by the physicist organization network, American scientists have used the "unappealing" nanoparticles to make the unwelded aluminum alloy AA 7075 weldable. The resulting products are expected to be used in automobile manufacturing and other fields to make their parts more portable. , More energy-saving, while maintaining the same firmness.

In the 1940s, scientists developed AA 7075, which is almost as strong as steel, but weighs only one-third of steel. Therefore, it helps to improve the fuel and battery efficiency of vehicles. It has been used in aircraft fuselages and Wings, smartphone casings and climbing carabiner etc.

But this alloy has a shortcoming-"stubborn character." It is difficult to weld, especially the welding method used in automobile manufacturing, making it impossible to be widely used. This is because when this alloy is heated during the welding process, its molecular structure will make its constituent elements aluminum, zinc, magnesium and copper flow unevenly, causing cracks in the welded products.

Now, UCLA engineers have developed a new method of welding AA 7075: inject titanium carbide nanoparticles (only one billionth of a meter in size) into the welding wire of AA 7075, and let these nanoparticles act as a connecting piece. Filling material between.

Using this new method, the tensile strength of the welded joint produced is as high as 392 MPa. In contrast, the tensile strength of AA 6061 aluminum alloy welded joints widely used in aircraft and auto parts is only 186 megapascals. According to research, heat treatment after welding can increase the tensile strength of AA 7075 joints to 551 MPa, which is comparable to steel. The new research also shows that filler wires injected with nanoparticles can also be more easily connected to other metals and metal alloys that are difficult to weld.

The main person in charge of the research said: "The new technology is expected to make this high-strength aluminum alloy widely used in products that can be manufactured on a large scale, such as cars or bicycles. Companies can use the same processes and equipment they already have to integrate this A super-strong aluminum alloy is incorporated into its manufacturing process to make its products lighter and more energy-efficient, while still maintaining its strength."

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