Significantly enhanced Young's modulus by beam spot oscillation during in-process sintering in laser-assisted...

Area of Science:

• Materials Science
• Nanotechnology
• Additive Manufacturing

Background:

• Fabricating defect-free microstructures is crucial for advanced applications.
• Conventional in-process sintering methods often result in layer defects.
• Improving the mechanical properties, such as Young's modulus, of microscale components is a key challenge.

Purpose of the Study:

• To develop an improved in-process sintering method for fabricating high-performance gold (Au) micropillars.
• To eliminate defects typically found in laser-assisted electrophoretic deposition (LAEPD) fabricated structures.
• To significantly enhance the Young's modulus of Au micropillars.

Main Methods:

• Developed an in-process sintering technique incorporating beam spot oscillations during laser-assisted electrophoretic deposition (LAEPD).
• Applied the oscillating beam spot method to fabricate Au micropillar structures.
• Post-annealed the fabricated micropillars to evaluate mechanical property improvements.

Main Results:

• Successfully eliminated layer defects in Au micropillars by employing beam spot oscillations during sintering.
• Micropillars fabricated with the new method could be post-annealed without deformation.
• Achieved a significant increase in Young's modulus, reaching 76.2 GPa after post-annealing.

Conclusions:

• In-process beam spot oscillation is an effective technique for defect elimination in LAEPD.
• The developed method enables the fabrication of robust Au micropillars with enhanced mechanical properties.
• This advancement holds potential for applications requiring high-stiffness microscale gold components.