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清华大学材料科学与工程研究院《材料科学论坛》学术报告:Towards new high-strength and heat-resistant Al alloy design enabled by additive manufacturing

清华大学材料科学与工程研究院《材料科学论坛》学术报告

报告时间:2024年11月4日下午3:30

报告人:Dr. Gang JI National Centre for Scientific Research (CNRS), France

报告地点:清华大学李兆基科技大楼A213会议室

邀请人:刘源老师


报告题目:Towards new high-strength and heat-resistant Al alloy design enabled by additive manufacturing

报告简介:

Softening due to severe strength degradation is inevitable in metallic materials at elevated temperatures especially at T>0.5Tm. For instance, at 300 °C, most Al alloys exhibit a low yield strength of only several tens of MPa, merely 10~40 % of that at room temperature. The popular pathways to enhance high-temperature strength have been realized by integrating second-phase reinforcements, such as micro-/nanosized intermetallics, precipitates or ceramic particles in the alloy matrix. In this regard, the most efforts have been made to maintain high volume fraction of the evenly-distributed second-phase particles, while improving their coarsening-resistance. The recent thriving additive manufacturing (AM) technology has shown not only its massive industrial application prospects in rapid prototyping of complex-shaped metallic component with unprecedented freedom, but also highly potential to achieve novel metastable and ultrafine microstructures exploiting its inherent rapid solidification process. In particular, a specific 3D ultrafine cellular-like architecture, consisting of one phase/domain in cells enclosed by the other phase/domain as 3D interconnected network as cell boundaries, has been extensively reported in AM Al, Fe, Cu, and other alloys. This work proposed a new architecture design strategy for developing high-strength and heat-resistant Al alloys using AM.


报告人简介:

Dr. G. JI obtained his Bachelor and Master degrees at Shanghai University in China and his Ph.D. degree at Université de technologie de Belfort Montbéliard (UTBM)in France. He joined CNRS as a permanent researcher in 2008. His current research interests include (1) design and engineering of interfaces of advanced metal matrix (nano-) composites for improved mechanical and thermal properties; (2) characterization and understanding of the metastable and anisotropic microstructure and defects in alloys and composites developed by additive manufacturing and (3) atomic-scale characterization for the local transformation of structure, chemistry and properties in complex multiphase materials. In his career to-date, Dr. JI has published around 150 peer-reviewed journal papers including Acta Mater., Angewandte Chimie, Nature Mater., (h-index: 42 from Google Scholar) and has around 100 contributions in international conferences. He is a member of editorial boards of journals “Nano Materials Science” and “Metals”. He was rewarded a 2016 Gledden Fellowship by University of Western Australia in Australia, 2023 IAAM scientist medal and is a guest Professor of Shanghai Jiao Tong University in China.




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