On the afternoon of November 3, 2023, Professor Matthias Bönisch from KU Leuven, Belgium, was invited to DGUT for academic exchanges and delivered an academic report titled "Load Sense Effects in Metastable Austenitic Stainless Steel Revealed by In-Situ Diffraction." The session was held in Conference Room A10 of the Interdisciplinary Science Research Center and was chaired by Professor Wang Biao, Dean of the School of Materials Science and Engineering. The report was conducted in a hybrid format combining online and in-person participation, with dozens of faculty members and students from the School of Materials Science and Engineering, the School of Mechanical Engineering, and other units attending.

During the session, Professor Bönisch presented a detailed report on the tension-compression asymmetry of advanced high-strength steels. Based on research conducted at the German Synchrotron Radiation Facility (DESY), his lecture examined the mechanical behavior responses of AHSS EN 1.4318 metastable austenitic stainless steel (MASS) with its distinctive deformation capability under tensile and compressive deformation conditions at various temperatures. Through full-pattern analysis and refinement, he extracted the phase volume fractions, phase transformation kinetics, crystallographic texture, lattice strains, and the stress/strain partitioning relationships between the austenite and martensite phases. It was found that compressive stress promotes martensitic transformation in the material, and that the austenite undergoes pronounced work hardening during compression, which is related to the increase in dislocation density within the material during the compression process.

Following the presentation, Professor Bönisch engaged in lively discussions with the faculty members and students present on key scientific issues such as synchrotron radiation techniques and their data processing methods, the origins of tension-compression asymmetry in structural materials, and the size effects on the mechanical properties of materials. Professor Bönisch patiently answered questions raised by the attendees. The session was marked by a strong academic atmosphere, and the event received enthusiastic feedback from faculty members and students afterwards.

Professor Matthias Bönisch completed his undergraduate studies in Materials Physics at the University of Vienna, Austria, in 2011. He then pursued his doctoral degree at the Institute for Solid State and Materials Research in Dresden, Germany. After earning his Ph.D. in 2016, he conducted research at the University of Illinois Urbana-Champaign in the United States. In 2018, he joined the Department of Materials Engineering at KU Leuven, Belgium, as a postdoctoral researcher, and was appointed Assistant Professor in 2023. Professor Bönisch's research focuses on the relationship between the microstructure and properties of structural and functional materials, with particular emphasis on martensitic transformations in titanium alloys and steels and the in-situ synchrotron characterization of phase transformation-related material behavior.

Draft: Huang Zhaowen

First Review: Liu Zhao / Second Review: Li Runxia / Third Review: Wang Biao