题目：Micro Laser Powder Bed Fusion: Process, Materials and Applications
时间：2026年3月20日 10:00-11:00
地点：365best体育亚洲官网 F210会议室
邀请人：张磊 副教授（机器人研究所）
Biography
Prof SONG Xu obtained his Bachelor degree from Tsinghua University in Mechanical and Automation Engineering in 2006 and Doctorate degree from University of Oxford, UK in Material Engineering in 2010. After two years as postdoc in Rolls-Royce University Technology Center (RR-UTC) Oxford on the residual stress analysis of different manufacturing processes, he joined SIMTech, A*STAR as a research scientist from 2012 and was promoted to senior scientist in 2019, working on various micro metal processing techniques, notably micro forming and micro selective laser melting. He joined the Chinese University of Hong Kong in 2019 as Assistant Professor and was promoted to Tenured Associate Professor in 2025, conducting research in the area of high-precision laser powder bed fusion process and design for additive manufacturing. He has published more than 180 journal papers on the topic of material deformation and manufacturing processes, and is listed in World’s Top 2% Scientists by Stanford University/Elsevier since 2023 onwards. His recent work on high-precision laser powder bed fusion process has led to many publications in Nature Communications and Science Advances, as well as industry awards such as the Red Dot Design Award and Inventions Geneva Gold Medal, etc. He currently serves as the Editor-in-Chief of <Materials and Design> (JCR Q1) and interim Editor-in-Chief of <Materials Today Advances> (JCR Q1).
Abstract
Micro laser powder bed fusion (µLPBF) technology offers great potentials to 3D printing research community, as it enables fabrication of complex metallic components with greater accuracy and better properties. By comprehensively comparing the µLPBF with conventional LPBF, it is found that better surface finish, finer microstructure, more desirable mechanical properties and smaller distortion can be obtained by µLPBF. Moreover, due to higher energy-volume-density than the conventional LPBF process, µLPBF is capable to fabricate highly reflective materials, such as pure copper, while maintaining low laser power, high resolution and good material properties. The µLPBF combining fine beam and small layer thickness managed to achieve the enhanced strength and ductility for the printed pure copper, while keeping the thermal and electrical conductivity close to the annealed one without heat treatment. To further push the printing resolution of pure copper to less than 100 µm and further reduce the surface roughness to less than 1 µm, we propose a facile oxide-dispersion-strengthening (ODS) strategy that enables AM of Cu with sub-100 μm (~70 μm) resolution by laser powder-bed fusion (PBF-LB). This ODS strategy starts with oxygen-assisted gas atomization (OAGA) to introduce ultrafine and well-dispersed Cu2O nanoparticles into the pure Cu powder feedstock. These nanoscale dispersoids not only improve the laser absorptivity and the viscosity of the melt, but also promote dynamic wetting behaviour, resulting in a low-enthalpy keyhole mode during printing and stabilization of the melt pool. The additively manufactured (AMed) ODS Cu exhibits a remarkable yield strength of ~450 MPa and a large uniform elongation of ~12%, while preserving a high electrical conductivity. The superb sub-100 μm printing resolution, paired with the excellent mechanical and electrical properties of our AMed ODS Cu, offers great opportunities to develop next-generation Cu micro-architected devices for functional applications.
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