Grain growth is a key process in the thermomechanical treatment of metals. Recently, the presence of local residual stresses within fully recrystallized grains has attracted increasing interest in connection with shear-coupled grain boundary migration mechanisms. In this work, we provide the first direct experimental measurements of residual elastic strain variations in fully recrystallized commercial-purity iron, on the order of $10^{-4}$. Using dark-field X-ray microscopy (DFXM), we performed non-destructive three-dimensional measurements of strain and orientation variations within individual grains. Our results reveal heterogeneous strain distributions across all measured grains. In one case, we observed several isolated dislocations accommodating two second-phase particles, exhibiting a localized strain signature with no detectable long-range effect. The formation mechanisms of intragranular residual strains and their potential influence on grain boundary migration during subsequent grain growth are discussed. This work highlights the importance of accounting for such residual elastic strains in future grain growth models.
Identifying grain boundary and intragranular pinning centres in Sm2(Co,Fe,Cu,Zr)17 permanent magnets to guide performance optimisation
Technische Universität Darmstadt（达姆施塔特工业大学）；Max Planck Institute for Sustainable Materials（马普可持续材料研究所）；Technical University of Darmstadt（达姆施塔特工业大学）；Forschungszentrum Jülich（于利希研究中心）；University of Glasgow（格拉斯哥大学）；VACUUMSCHMELZE GmbH & Co. KG（真空熔炼有限公司）；Universität Duisburg-Essen（杜伊斯堡-埃森大学）；Imperial College London（帝国理工学院）；Univ Rouen Normandie（鲁昂诺曼底大学）
Physics-aware global Rietveld refinement for high-energy X-ray diffraction microscopy with application to reconstructing intragranular orientation and strain fields
California Institute of Technology（加州理工学院）；Massachusetts Institute of Technology（麻省理工学院）
Influences of Granular Constraints and Surface Effects on the Heterogeneity of Elastic, Superelastic, and Plastic Responses of Polycrystalline Shape Memory Alloys
Influence of temperature, initial grain-boundary bubble density and grain structure on fission gas behaviour in UO$_2$: a 3D hybrid multiscale study
University of Florida（佛罗里达大学）；Idaho National Laboratory（爱达荷国家实验室）；University of Tennessee（田纳西大学）；Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室）；Lawrence Livermore National Laboratory（劳伦斯利弗莫尔国家实验室）
