On October 17th, at the invitation of Professor Wang Junqiang, Professor En Ma of Xi'an Jiaotong University and Professor Yi Li of the Institute of Metal Research, Chinese Academy of Sciences visited NIMTE and gave academic reports entitled "Asymmetry of Amorphous Solid Deformation" and "Retoughening of Relaxed and Brittlemental Amorphous Alloys" respectively.
With his personal "Ten question" mode and wonderful chalk demonstration small experiments, Professor Mahn vividly introduced his team's subversive common-sense innovation discovery: the pressure of amorphous silicon at the submicron scale (almost non-defective) is not greater than the tensile force, and then analyzed and discussed this novel discovery through a series of experiments and calculations. Professor Li Yi shared a new injury-free, efficient and rapid enthalpy relaxation rejuvenation method explored by his team. The alloy obtained by this method not only does not relax but achieves rejuvenation, and its plasticity and fracture toughness are higher than those in the casting state. Subsequently, he described and analyzed in detail the reasons for its retoughening from the perspectives of atomic stacking, atomic order, and cluster connection model. Finally, he pointed out that this method can control the properties and structure of amorphous alloys simply and efficiently, and will have a very broad application prospect. After the report, the participants had a lively discussion and exchange on annealing process, atomic order, etc.
Dr. Ma graduated from Tsinghua University. He has worked at MIT, University of Michigan, UIUC, LSU and other universities, and was a professor in the Department of Materials Science and Engineering at Johns Hopkins University from 1998 to 2020. He is currently a professor at the Material Innovation Design Center of Xi'an Jiaotong University. Professor Mahn has done a lot of research in the field of metastable materials, including amorphous alloys, phase change storage alloys, high-entropy alloys, nanocrystalline metals, etc. He has published about 370 papers, with a total of more than 47,000 citations and an h-factor of 110. He has given about 150 keynote or invited presentations at TMS, MRS, BMG, RQ, ISMANAM and other international conferences. He received the ASM International Silver Award for Materials Science Research in 2004, was elected an ASM Fellow in 2009, an APS Fellow in 2010, and an ISMANAM Senior Scientist Award in 2011. In 2015, he was awarded MRS Fellow. In addition, he was selected into the Thomson Reuters Global Highly Cited Scientists List in 2002-2012, 2014-2016 and 2018.
Yi Li worked in the Department of Materials Science and Engineering, National University of Singapore, and has successively held lecturer, senior lecturer, associate professor (tenured), and professorship. In 2011, he was introduced to the Institute of Metal Research, Chinese Academy of Sciences as a recipient of the National Talent Program. He served as the director of the Non-equilibrium Metal Materials Research Department of Shenyang National (Joint) Laboratory of Materials Science and a doctoral supervisor. He mainly focuses on the preparation and performance of non-equilibrium metal materials, including bulk amorphous alloys. Has a number of amorphous alloy patents suitable for industrial applications. He has published more than 250 SCI papers in international first-class academic journals such as Science, Nature Communication, PRL, Nano Letters, Acta Materialia, etc..
