Spatiotemporal mapping of alloy mesostructure dynamics via multimodal coherent X-ray diffraction imaging

• 成果类型: Article
• 署名作者: Takazawa, Shuntaro; Ninomiya, Kakeru; Ha, Minh-Quyet; Vu, Tien-Sinh; Sasaki, Yuhei; Abe, Masaki; Uematsu, Hideshi; Okawa, Naru; Ishiguro, Nozomu; Ozaki, Kyosuke; Hatsui, Takaki; Hoshino, Taiki; Nishibori, Maiko; Dam, Hieu-Chi; Takahashi, Yukio
• 署名单位: Tohoku University; Tohoku University; RIKEN; Tohoku University; Japan Advanced Institute of Science & Technology (JAIST); Tohoku University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-9379
• DOI: 10.1073/pnas.2513369122
• 发表日期: 2025-09-23
• 关键词: mg-y; mechanical-properties; ordered structure; high-resolution; zn; SCATTERING; strength; crystallography; precipitation; transmission

摘要

Understanding mesoscale structural dynamics of precipitation-strengthened alloys is essential for optimizing the mechanical performances of these alloys. Herein, we establish a multimodal coherent X-ray diffraction imaging framework for spatiotemporal mapping of mesoscale structural dynamics in precipitation-strengthened alloys. As a demonstrative application, we visualized the structural evolution in Mg97Zn1Gd2 during isothermal annealing at 700 K, revealing real-time dynamics of nucleation, growth, and coarsening. Ptychographic reconstruction enabled imaging of microstructural transformations across a wide field of view (similar to 100 mu m(2)) with temporal resolution spanning several hours. We observed decomposition of (Mg, Zn)(3)Gd and concurrent precipitation and coarsening of long-period stacking ordered phases. To resolve local dynamics at finer spatiotemporal scales, we combined dynamic coherent diffraction imaging with X-ray photon correlation spectroscopy, targeting selected regions (similar to 10 mu m(2)) with time resolution down to tens of seconds. This approach revealed the rapid formation of nanoscale precipitates within 10 s after heating, followed by coarsening over several hundred seconds. Additionally, we applied optical flow analysis-a computational method to track motion patterns-to visualize and quantify the nucleation, growth, and coarsening kinetics. The abovementioned findings demonstrate the capability of in situ coherent X-ray techniques to acquire the real-time evolutions of mesoscale structures in complex materials. Our methodology offers a robust framework for investigating dynamic phenomena in diverse material systems, including metals, polymers, and functional nanomaterials, under realistic thermal or mechanical conditions.