Time: 14:00-15:30, Tues., August 20, 2024
Venue: E10-304, Yungu Campus
Host: Dr. Yao Yang, Assistant Professor, Westlake University
Language: Chinese
Speaker：
Prof. Jun Ding
School of Materials Science and Engineering
Xi'an Jiaotong University
Biography:
Dr. Jun Ding is a Professor at the School of Materials Science and Engineering, Xi'an Jiaotong University. He received his Bachelor's degree from Shanghai Jiao Tong University in 2010 and Ph.D. degree from Johns Hopkins University in 2014. Since 2015, he has conducted postdoctoral research at the Lawrence Berkeley National Laboratory (under the collaboration with Professors Robert Ritchie and Mark Asta). He joined the School of Materials Science and Engineering at Xi'an Jiaotong University in 2019. His primary research interests include high-performance alloy materials such as amorphous alloys and high-entropy alloys, multi-scale simulations and machine learning, and metal additive manufacturing. He has published over 60 research papers, including (co-)first or corresponding author papers in prestigious journals such as Nature (1), Nature Materials (2), PNAS (6), and Nature Communications (5), with over 4,700 citations. He has received several awards and honors, including the National Youth Talent Program (2019); ISMANAM Young Scientist Award (2023), the Chinese Materials Research Society's Outstanding Young Scientist Award (2023), Xiaomi Scholar (2023), and the Acta Student Award (2014).
Abstract:
As two typical high-performance disordered alloys, metallic glasses and high-entropy alloys exhibit exceptional mechanical, irradiation, and functional properties, making them promising for future development. Amorphous alloys, also known as metallic glasses, feature atomic disorder (or a glassy state); in contrast, high-entropy alloys have a defined crystal structure but display chemical disorder. The atomic-scale disordered structures of these two types of alloys impart unique material properties but also present significant challenges in understanding their structure-property relationships. This presentation will introduce a series of studies conducted by our research group on the atomic-scale structure-property relationships of amorphous alloys and high-entropy alloys using multi-scale computational simulations, machine learning, and experimental techniques. These studies include (1) achieving several orders of magnitude acceleration in atomic-scale simulations of amorphous alloys, enabling the cooling rate of CuZr amorphous alloys to be reduced from the traditional molecular dynamics simulation rate of 10¹⁰ K/s to an experimental-scale cooling rate of ~10³ K/s, where unique deformation behaviors were observed in these samples; (2) investigating the characteristics of local chemical order in FCC and BCC high-entropy alloys, controlling varying degrees of local chemical order to influence dislocation slip, deformation twinning and diffusion pathways of point defect (vacancies and interstitials), thereby designing high-entropy alloys with high strength, toughness, or resistance to radiation damage.
Contact:
Songmei Zhu
zhusongmei@westlake.edu.cn
