Direct observation of solute atom diffusion dynamics towards {101¯2} twin boundary in a magnesium alloy

Materials Research Letters 2026 Open access

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Authors: Shufen Chu, Frank F. Xu, Yangxin Li, Xiaodong Li, Zhihao Xiong, Shuanglan Lin, Yanhe Wang, Yujun Xie, Xiaoqin Zeng
DOI: 10.1080/21663831.2026.2613038
Cited by: 1
References: 35

Abstract

Understanding solute segregation at twin boundaries (TBs) is essential for tailoring the microstructure and properties of magnesium alloys. Using in situ scanning transmission electron microscopy, we directly observe the diffusion behavior of Y atoms at a {101¯2} TB in a Mg-Y alloy. Atomic-resolution imaging reveals a metastable segregation structure with alternating Y concentration levels in the basal planes. Time-resolved images further trace the diffusion paths of Y atoms. Density functional theory calculations determine the diffusion energy barriers and preferred segregation sites. Our findings provide direct insights into solute-TB interactions, guiding TB engineering and heat treatment strategies in magnesium alloys.

Fields of Study & Subjects

Magnesium Alloys: Properties and Applications Hydrogen Storage and Materials Aluminum Alloy Microstructure Properties

Publication details

Journal / source
Materials Research Letters
Publisher
Informa UK Limited
Volume
14
Issue
3
Pages
257–266
Publication date
11 February 2026
Language
EN