Abstract
Dynamic compression tests were conducted using a split Hopkinson pressure bar along the transverse direction at strain rates (SRs) of 3200 and 6000 s−1. The initial microstructure significantly affected the flow stress behavior and microstructural evolution of the two studied AM80 magnesium alloys. Under the same SR loading, the as-extruded alloy exhibited an apparently higher flow stress. At a SR of 6000 s−1, the flow stress of the as-extruded alloy exhibited a visible decrease (~ 34 MPa) as the strain increased to ~ 0.2, whereas a constant flow stress was exhibited by the solution-treated alloy. High-density dislocations and mechanical twins were detected in the two alloys at a SR of 3200 s−1. Interestingly, dynamic recrystallization (DRX) with an average grain size of ~ 2 µm was only identified in the as-extruded alloy as the applied SR increased to 6000 s−1. The increased localized deformation in the as-extruded alloy due to the retained strain energy and high critical twinning stress improved the DRX driving force, thereby resulting in visibly different micrographs of the two alloys when impacted at the SR of 6000 s−1.
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This work was supported by the National Natural Science Foundation of China (Nos. 51601062 and 51605234) and the Natural Science Foundation of Hunan Province (No. 2019JJ50586).
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Guo, P., Li, L., Liu, X. et al. Room-Temperature Microstructural Evolution of Extruded AM80 Magnesium Alloys under Dynamic Loading. J. of Materi Eng and Perform 28, 3430–3437 (2019). https://doi.org/10.1007/s11665-019-04123-x
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DOI: https://doi.org/10.1007/s11665-019-04123-x