Microscale 3D Printing of Nanotwinned Copper

Area of Science:

• Materials Science
• Additive Manufacturing
• Nanotechnology

Background:

• Nanotwinned (nt)-metals offer enhanced mechanical and electrical properties over conventional microstructures.
• Existing fabrication methods for nt-metals include pulsed electrodeposition (PED), sputtering, and deformation techniques.
• A significant gap exists in additive manufacturing processes for producing nt-metals.

Purpose of the Study:

• To demonstrate the microscale 3D printing of nanotwinned copper (nt-Cu) using a novel additive manufacturing approach.
• To investigate the microstructural characteristics and properties of the 3D printed nt-Cu.
• To establish a viable method for fabricating complex 3D nt-metal structures.

Main Methods:

• Development of a room temperature localized pulsed electrodeposition (L-PED) process for additive manufacturing.
• Layer-by-layer fabrication of microscale nt-Cu structures.
• Characterization of microstructural features, including twin boundary density and purity.

Main Results:

• Successful microscale 3D printing of fully dense nt-Cu with a high density of coherent twin boundaries.
• Achieved low impurity levels and minimal microstructural defects in the printed nt-Cu.
• Demonstrated good mechanical and electrical properties without the need for post-processing.

Conclusions:

• The L-PED process enables direct 3D printing of complex nt-Cu microstructures.
• This advancement opens possibilities for fabricating advanced materials for metamaterials, sensors, and micro/nanoelectromechanical systems.
• The study overcomes limitations in producing nt-metals via additive manufacturing.