清华大学材料科学与工程研究院《材料科学论坛》学术报告
报告时间：2026年1月5日下午14:00-15:30
报告人：Dmitri Louzguine教授（日本东北大学）
报告地点：清华大学逸夫技术科学楼B213陶瓷报告厅
邀请人：陈娜老师
报告题目：How metallic glasses become crystals
报告简介：
Metallic glasses are solids with a disordered atomic structure that nevertheless behave like strong, rigid materials. Many of them show excellent mechanical, magnetic, and chemical properties, as well as good biological compatibility. When heated metallic glasses eventually transform into crystalline phase(s), and the atomic-level mechanisms behind this transformation are still not fully understood. In this talk, I will explain how metallic glasses become crystals, focusing on the key processes that control nucleation and growth far from equilibrium. Understanding these processes is important both for preventing unwanted crystallization, which improves glass stability, and for deliberately creating nanocrystalline composites with useful properties.
With my colleagues we carried out heating experiments below the glass-transition temperature, where atomic motion is slow and differs between alloying elements. These differences lead to unexpected crystallization behavior, including faster-than-expected crystal growth and complex transformation pathways. In rare-earth metal containing metallic glasses, crystallization is strongly influenced by pre-existing oxide particles that act as preferred nucleation sites. Advanced transmission electron microscopy is essential for directly visualizing these processes and for correctly interpreting calorimetry and X-ray diffraction data. I will also present recent results on solid-state, room-temperature nanocrystallization induced by mechanical processing in Fe- and Mg-based metallic glasses. These findings provide new insight into how nanocrystals form and open pathways for designing advanced metallic glass nanocomposites.
报告人简介：
Dr. Louzguine is a principal investigator at WPI Advanced Institute for Materials Research in Tohoku University of Japan. His research areas include metallic glasses, nanostructured materials, composite materials and high-strength crystalline alloys. He obtained several academic awards including the Young Participating Scientist Award of ISMANAM 2002 and Outstanding Contribution in Reviewing Awards from Materials Today, Materials Science and Engineering A and Journal of Alloys and Compounds.