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3D printing, also known as metal-based additive manufacturing, refers to a technique in which metal powders are added layer by layer to manufacture, and this method can increase design freedom and manufacturing flexibility. Unfortunately, of the more than 5,500 alloys currently in use, the vast majority cannot be additive-manufactured. Only a few alloys can be reliably printed because the solidification kinetics in the manufacturing process can lead to periodicity in the resulting material. crack.
This time, John Martin and colleagues at the Hughes Research Laboratory in the United States introduced nanoparticles to control solidification during the additive manufacturing process, providing a good solution to this problem. They first selected aluminum alloys that are closely related to automotive, aerospace, and consumer applications. Then they used computer software to analyze more than 4,500 combinations of different alloys and nanoparticles, and finally selected surface-treated (treated) zirconium as a A suitable nanoparticle material.
In the experiment, the researchers gave two kinds of aluminum alloys - 7075 (usually the 7 series aluminum alloy, the best strength) and 6061 (no 7 series high strength, but excellent processing performance) atomized powder plus surface zirconium hydride The nanoparticle coating is then subjected to selective laser melting for additive manufacturing. As a result, it was found that the alloy manufactured using the nanoparticle did not show crack marks and had a strength comparable to that of the forged material, as compared with the component manufactured using the 7075 and 6061 powders without nanoparticle coating.
The researchers believe that this new method not only breaks through the constraints of traditional manufacturing methods, but is not inferior in strength, and can be applied to other alloys, thereby further expanding the "families" of additive materials.
The British "Nature" magazine released a breakthrough on materials science on the 20th: American scientists have developed a new method for 3D printing of high-strength aluminum alloys. At present, most alloys developed using additive manufacturing methods will exhibit periodic cracks, but new alloys not only have no crack marks, but also have strength comparable to forged materials. This method can also be used for the manufacture of other alloys.
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