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Nanotechnology Makes Special Aluminum Alloys Weldable

Jan 28, 2019

According to a recent report by the physicist's organization network, American scientists have made the aluminum alloy AA 7075, which cannot be welded, become solderable by means of "the ugly" nanoparticles, and the obtained products are expected to be used in the field of automobile manufacturing to make their parts lighter. It is more energy efficient and at the same time firm.

In the 1940s, scientists developed the AA 7075, which is almost as strong as steel, but weighs only one-third of the steel, thus helping to improve the fuel and battery efficiency of the vehicle. It has been used in aircraft fuselage and Wing, smartphone case and climbing carabiner.

But this alloy has one drawback - "sexual stubbornness." It is difficult to weld, especially in welding methods used in automobile manufacturing, making it unusable. This is because when the alloy is heated during the welding process, its molecular structure causes the constituent elements aluminum, zinc, magnesium and copper to flow unevenly, resulting in cracks in the welded product.

Now, UCLA engineers have developed a new method of welding AA 7075: injecting titanium carbide nanoparticles (only one billionth of a meter in size) into the wire of AA 7075, allowing these nanoparticles to act as connectors. Filling material between.

Using this new method, the welded joint produced has a tensile strength of up to 392 MPa. In contrast, AA 6061 aluminum alloy welded joints, which are widely used in aircraft and automotive parts, have a tensile strength of only 186 MPa. According to the study, heat treatment after welding can increase the tensile strength of AA 7075 joint to 551 MPa, which is comparable to steel. New research has also shown that filler wires filled with nanoparticles can also be more easily joined to other metals and metal alloys that are difficult to weld.

Li Xiaochun, the principal of the study, 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 they already have and The equipment incorporates this super-strong aluminum alloy into its manufacturing process, making it lighter and more energy efficient while still maintaining its strength."

Researchers have partnered with a bicycle manufacturer to make bicycle bodies. 


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