Three-dimensional nucleation and growth of deformation twins in magnesium

• 成果类型: Article
• 署名作者: Lee, Sangwon; Pilipchuk, Michael; Yildirim, Can; Greeley, Duncan; Shi, Qianying; Berman, Tracy D.; Creuziger, Adam; Rust, Evan; Detlefs, Carsten; Sundararaghavan, Veera; Allison, John E.; Bucsek, Ashley
• 署名单位: University of Michigan System; University of Michigan; University of Michigan System; University of Michigan; European Synchrotron Radiation Facility (ESRF); United States Department of Energy (DOE); Los Alamos National Laboratory; University of Michigan System; University of Michigan; National Institute of Standards & Technology (NIST) - USA
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11932
• DOI: 10.1126/science.adv3460
• 发表日期: 2025-08-07
• 页码: 632-636
• 关键词: microstructure; EVOLUTION

摘要

At two-thirds the weight of aluminum, magnesium alloys have the potential to reduce the fuel consumption of transportation vehicles. These advancements depend on our ability to optimize the desirable versus undesirable effects of deformation twins, which are three-dimensional (3D) microstructural domains that form under mechanical stresses. Previously only characterized through surface or thin-film measurements, we present 3D in situ characterization of deformation twinning inside an embedded grain over mesoscopic fields of view using dark-field x-ray microscopy supported by crystal plasticity finite element analysis. The results revealed the role of triple junctions on twin nucleation and the sequence and irregularity of twin growth and showed that twin-grain junctions, twin-twin junctions, and twin boundaries were the sites of localized dislocation accumulation.