Revisiting the Al-Si phase diagram upon a broad range of cooling rates

Guest Speaker：Assistant Professor Eason Chen，Nanyang Technological University, Singapore Inviter: Assoc. Prof. Zhao Shen

Date&Time: Thursday, 5.Dec., 14:00-15:30

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

Biography:

Dr Yi-Sheng (Eason) Chen is a Nanyang Assistant Professor (NAP) and Singapore National Research Foundation (NRF) Fellow at School of Materials Science and Engineering, Nanyang Technological University, Singapore. His research focuses on materials characterisation, metallurgy, and hydrogen technologies. He specialises in using advanced microscopy techniques such as atom probe tomography (APT) and electron microscopes to develop the structure-property-processing relationship of advanced metallic materials. The insights gained from these endeavours will contribute to a deeper understanding of material behaviour, paving the way for the development of next-generation high-performance materials.

Before he joined NTU, he was a group leader, an Australian Research Council Fellow, and a University of Sydney Fellow at the Australian Centre for Microscopy and Microanalysis and the School of Aerospace, Mechanical and Mechatronic Engineering at the University of Sydney, Australia. At the University of Sydney, he established a 3 million USD research program around using advanced microscopes to observe hydrogen atoms in steels for developing solutions against hydrogen embrittlement problems. Before moving to Australia, Eason completed his PhD in Materials in 2018 at the University of Oxford. Before PhD, he served in consulting industry for several years after he completed his Master in Materials Science in 2009 and Bachelor in Materials Science in 2007 at Taiwan Tsing Hua University.

Abstract:

The presence of hydrogen in metallic materials can cause catastrophic early fracture that is known as hydrogen embrittlement. Observing the hydrogen and its associated influences in microstructure has been a grand challenge that limits the development of a solution to this problem. To this end, our research group have developed a special tool, cryogenic atom probe tomography (cryo-APT), for hydrogen mapping and applied it in combination with a micromechanical approach to investigate hydrogen embrittlement in steels. Our efforts have led to new insights for deciphering hydrogen trapping and embrittling mechanisms in steels, facilitating the development of the steel microstructure that has a good resistance to hydrogen embrittlement.