On the morning of July 3, 2023, Professor Li Weiguo from the College of Aerospace Engineering at Chongqing University and Professor Su Haijun from the School of Materials Science and Engineering at Northwestern Polytechnical University were invited to visit DGUT and deliver academic reports at the Interdisciplinary Science Research Center. The reports were 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 and other units attending.

First, Professor Li Weiguo delivered an academic report titled "The Principle of Mechanical-Thermal Energy Density Equivalence and Its Applications," chaired by Professor Wang Biao, Dean of the School of Materials Science and Engineering. Closely aligned with the major demands of national high-end technology development and targeting advanced high-temperature materials and structures, Professor Li focused on their solid mechanical behavior, strength theory, and characterization methods under ultra-high-temperature service conditions, and developed the original theory of mechanical-thermal energy density equivalence. He further introduced the application of this theory to the theoretical characterization of material properties related to electrical, acoustic, irradiation, and high-pressure effects. Finally, using the theoretically established characterization models for temperature-dependent ultimate tensile strength and critical shear stress as examples, he provided a comprehensive exposition of the extended applications of this theoretical framework in interdisciplinary fields such as mechanics and mechanical engineering. At the conclusion of the report, Professor Li Weiguo engaged in discussions with the attendees and provided detailed answers to questions of interest.

Subsequently, under the chairmanship of Professor Li Runxia, Vice Dean of the School of Materials Science and Engineering, Professor Su Haijun shared his research work titled "Laser Additive Manufacturing and Defect Control of Ultra-High-Temperature Oxide Eutectic Ceramics." Professor Su first introduced the characteristics, application prospects, and common preparation methods of oxide eutectic in-situ composite ceramics. He then proposed a novel melt preparation technique based on laser additive manufacturing to address the current bottlenecks in the preparation process. He went on to present the original work carried out in developing this technology, including spherical powder preparation techniques for oxide eutectic compositions suitable for laser additive manufacturing, laser directed energy deposition systems, and selective laser melting systems. Finally, Professor Su introduced the mechanisms of crack formation during the preparation of oxide eutectic ceramics, the solidification microstructure characteristics during multi-layer deposition, the banded structure formation mechanism, as well as the mechanical properties and thermal stability. He provided an outlook on future development directions and priorities, and engaged in discussions with the attendees on the content of the report.

Professor Li Weiguo serves as Vice Dean (presiding over work) of the College of Aerospace Engineering at Chongqing University, where he is a professor and doctoral supervisor. He has been selected for the National High-Level Talent Program, the Young and Middle-Aged Science and Technology Innovation Leading Talents Program of the Ministry of Science and Technology, the New Century Excellent Talent Support Program of the Ministry of Education, and is a "Hong Shen" Distinguished Scholar at Chongqing University. His research primarily focuses on the mechanical behavior of materials in extreme environments, strengthening and toughening theories, and damage and fracture mechanics. He currently serves as a Fellow of the International Association of Applied Mechanics and on multiple committees, leads several research teams including at key laboratories, and serves on the editorial boards of multiple journals. He has presided over seven projects funded by the National Natural Science Foundation of China, including a major scientific research instrument development project, and over 30 other projects. He has published more than 230 academic papers in journals such as JMPS, IJSS, and the European Journal of Mechanics, and holds 15 authorized invention patents.

Professor Su Haijun is a professor and doctoral supervisor at the School of Materials Science and Engineering, Northwestern Polytechnical University, and serves as Vice Dean of the school. He is a recipient of the National Science Fund for Excellent Young Scholars and the China Nonferrous Metals Innovation Competition Award, and was selected for the first batch of the "Hong Kong Scholars" Program. He is recognized as a Young Science and Technology Star of Shaanxi Province and leads a Young Innovation Team at Shaanxi universities, among other academic leadership roles. He has long been engaged in advanced directional solidification technology and theory, as well as research on new materials, covering high-temperature alloys, high-entropy alloys, and directional solidification and additive manufacturing technologies. He has presided over seven National Natural Science Foundation projects, including key and excellent young scholar projects, and over 30 other projects, published more than 160 SCI papers, been granted 50 Chinese invention patents and 2 U.S. invention patents, and co-authored three monographs. He has received the Special Prize for Outstanding Scientific and Technological Research Achievements of Shaanxi Higher Education Institutions, the First Prize of the Shaanxi Provincial Science and Technology Award, and the First Prize of the Shaanxi Provincial Metallurgical Science and Technology Award, among other honors.

Draft: Dou Ruqiang

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