Invited speaker

Prof. Qun Luo

Shanghai University

E-mail: qunluo@shu.edu.cn

Title: Precipitation and Mechanical Property Prediction of Mg Alloys during Aging Treatment

Profile:

Luo Qun is a Research Professor and Ph.D. supervisor at Shanghai University. Her research focuses on the design of cast Al/Mg alloys based on phase transformation thermodynamics and kinetics calculations. She has published over 90 peer-reviewed papers in journals such as Adv. Mater., J. Magnes. Alloy., J. Mater. Sci. Technol., Scripta Mater., including 2 hot papers and 9 ESI highly cited papers. Dr. Luo has received several prestigious honors, including the Young Scientist Award of the International Magnesium Science and Technology Conference, the First Prize of Science and Technology Award of the Nonferrous Metals Industry of China, and selection into the World’s Top 2% Scientists list (2023, 2024) and the Youth Talent Support Project of the China Association for Science and Technology. She currently serves as a council member of the Chinese Materials Research Society, and as a youth editorial board member for journals such as JMA, RM, MGE Advances, JMI, IJMMM, and The Chinese Journal of Nonferrous Metals.

Abstract：

Aging treatment is an important process for strengthening magnesium alloys. However, the nanoscale and metastable characteristics of the precipitated phase during the aging process make the prediction of the precipitation process and mechanical properties challenging. Mg-Gd alloy, as a key system of high-strength magnesium alloys, has superior comprehensive performance. In this work, the evolution process of the phase in the Mg-Gd alloy was characterized by the high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) system. The thermodynamic description was established by comprehensively considering the metastable phase boundary and the precipitation kinetic behavior. This method overcomes the limitation that traditional methods cannot be applied to metastable precipitated phases. The nucleation, growth and coarsening behaviors described by precipitation kinetics simulation were used to clarify the kinetic mechanism of aging enhancement. The quantitative relationship between the precipitation kinetics of the phase in Mg-Gd alloy and its composition, aging temperature and time was established. Furthermore, through the coupled strengthening model, the quantitative relationship of "alloy composition - aging process - precipitated phase - mechanical properties" was established. The predicted temperature-time-hardness (TTH) relationship can provide intuitive theoretical guidance for the aging process design of MG-GD-based alloys.