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Meeting 2027 TMS Annual Meeting & Exhibition
Symposium Microstructure-Sensitive Design and Advanced Characterization: An MPMD/SMD Symposium Honoring David T. Fullwood
Presentation Title Grain boundary segregation-controlled plasticity in magnesium rare-earth alloys
Author(s) Gaoming Zhu, Shibo Zhou, Dietmar Letzig
On-Site Speaker (Planned) Gaoming Zhu
Abstract Scope Magnesium rare-earth alloys show improved ductility, but the role of grain boundary segregation in local plastic deformation is still not fully clear. In this work, we study Mg-RE alloys with grain boundary segregation, including Mg-Mn-Sm and Mg-Mn-Nd systems, using in-situ and multiscale characterization. In-situ synchrotron X-ray diffraction was used to follow lattice strain evolution during tensile deformation. Quasi-in-situ EBSD and SEM slip trace analysis were used to examine grain rotation, twinning, slip activation and crack formation. TEM and HAADF-STEM were used to identify dislocation structures and solute segregation at grain boundaries. The results show that rare-earth segregation changes the local deformation mode near grain boundaries. Non-basal slip becomes more active, while severe strain localization and intergranular cracking are reduced. These results indicate that grain boundary chemistry plays an important role in microstructure-sensitive plasticity, dislocation accumulation and damage evolution in Mg alloys.
Proceedings Inclusion? Planned:

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