Abstract
In this study, the gradient microstructure of Mg-Y-Nd-Zr alloy processed by an ultrasonic surface rolling process (USRP) is characterized by electron backscatter diffraction analysis and transmission electron microscopy. The mechanism of microstructure evolution and its effect on mechanical properties of the alloy are discussed in detail. The grain size and orientation of Mg-Y-Nd-Zr alloy after USRP treatment changed gradually along the processing depth. The grain refinement mechanism was elucidated as follows: First, the coarse-grained matrix was subdivided by dislocation slip and twins and further refined into sub-structures by multiple techniques, such as mutual intersection and fragmentation between twins, the interaction between twins and dislocations, and the entanglement of dislocations. Finally, equiaxed nanocrystals with high-angle grain boundaries were formed by sub-grain rotation and recrystallization. The strength improvement of the alloy was mainly attributed to the contributions of grain refinement and dislocation strengthening. The synergistic deformation between the gradient structures is the main reason for the excellent strength and plasticity matching of the alloy.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51661007), the central government guides local science and technology development special project ([2019] 4011), and the Guizhou University cultivation project ([2019] No. 15). Guiyang science and technology talent training project (Construction Contract [ 2023 ] 48-1)
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YL did writing—original draft. WL done writing—review & editing and supervision. YS and LC investigated the study. GC and GD gave software.
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Liu, Y., Li, W., Sun, Y. et al. Effect of ultrasonic surface rolling process on microstructure and properties of rolled Mg-Y-Nd-Zr alloy. J Mater Sci 58, 9362–9381 (2023). https://doi.org/10.1007/s10853-023-08615-z
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DOI: https://doi.org/10.1007/s10853-023-08615-z