Designing multifunctional materials for extreme environments

Guest Speaker：Research group leader Liuliu Han, Max Planck Institute for Sustainable Materials, Germany

Inviter: Ass.Prof. Chao Yang

Date&Time: Tuesday, 15 July, 9:30-10:45

Venue: Yiucheng Lecture Hall (500), Xu Zuyao Building

Biography:

Liuliu Han received his Bachelor and Master degrees from Central South University (China). In 2018, he was a visiting scholar at the International Iberian Nanotechnology Laboratory (Portugal). He joined the Max-Planck-Institut für Eisenforschung (Germany) and defended his doctorate with distinction (mit Auszeichnung) in the field of designing strong and ductile soft-magnetic multicomponent alloys at RWTH Aachen University (Germany) in 2022. He is a research group leader at the Max Planck Institute for Sustainable Materials (Germany), funded by the European Innovation Council since 2023.

Abstract:

Advanced materials must withstand complex and extreme environments across a wide variety of structural and functional applications while promoting sustainability. Otherwise, the longevity, safety, and function of products will be highly affected and even result in catastrophic failure due to the interactions with the environment during operation. The fundamental challenge of reconciling multiple conflicting properties in one material is the inverse relationship between different properties and their corresponding microstructural features. In addition, the greenhouse gas emission and energy consumption of the materials during the synthesis, processing, service, and end-of-life recycling must be reduced. This seminar will focus on the strategies for designing magnetic alloys for high mechanical loading service conditions, in which conventional magnetic materials are mechanically either too soft or brittle. The interplay between structural defects and their interaction with the magnetic domain wall and dislocations is important in bridging mechanical and magnetic performance. However, the type, composition, volume fraction, and shape of the structural defects must be carefully tuned to enhance one performance without sacrificing the others. In addition, the greenhouse gas emission and energy consumption of the materials during the synthesis, processing, service, and end-of-life recycling must be reduced. This is especially true for materials applied under extreme environments because the post-consumer components are highly contaminated during service, e.g., oxidized and corroded, and thus cause additional challenges to recycling-related effects. A systematic investigation of the key material production, manufacturing, and recycling chain circulars of other multifunctional materials will also be discussed.