Recently, Yale University, Researchers at Desktop Metal and the Massachusetts Institute of Technology have adopted a new approach to apply a new material that is tougher than the best metals but has plastic flexibility – metallic glass – to 3D. Printing, which means that metal 3D printing may soon become simple and practical. The results of the study were published in the journal Material on August 1.
3D printing of metal parts is challenging and limited because metal materials are usually not easily squeezed. Researchers have previously done 3D printing of metal parts, using highly localized and solidified metal powders, and molding them into the desired structure. However, this process is costly and complex and often does not produce the desired performance.
Blocked metallic glasses (BMGs) have a unique atomic structure. When they are cooled from liquid to solid, their atoms are randomly arranged without crystallizing like traditional metals, so bulk metallic glass ( BMGs) can continue to soften like a thermoplastic when heated. Researchers have shown that BMGs can be used for 3D printing, producing solid, high-strength metal parts under environmental conditions similar to thermoplastic 3D printing.
The research team focused on a BMG material made of zirconium, titanium, copper, nickel and niobium that is excellent in performance and easy to obtain. It is theoretically proven that this method can print a wider range. BMGs. Their breakthroughs have greatly reduced the cost and resources involved in utilizing the softening characteristics of BMGs, eliminating the need to select thermoplastic parts to replace metal parts in materials and engineering applications.
The researchers used an amorphous rod with a diameter of 1 mm and a length of 700 mm. The extrusion temperature of 460 ° C and the pressing force of 10 to 1000 Newtons allowed the softened fiber to pass through a 0.5 mm diameter. nozzle. The researchers were surprised to see the printed BMG parts. Jittisa Ketkaew, co-author and Yale University, said: “We originally only expected high intensity in the parallel printing direction, and I didn’t expect the intensity in the vertical direction to be strong.”
The co-author Punnathat Bordeenithikasem said The ability to print metal parts as easily as thermoplastics will revolutionize the field of metal additive manufacturing. “In addition to prototyping, the viability of printed components and the versatility of some designs make this 3D printing technology suitable for manufacturing high-performance components for medical, aerospace and spacecraft applications.” California Institute of Technology NASA Jet Propulsion Laboratory Researcher Bordeenithikasem said.
Compile: Huahua Review: Auntie Editor: Zhang Meng
Journal Source: “Materials”
Journal Number: 1996-1944
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