Abstract
Microstructure and mechanical properties of Mg–Zn–Y alloys with different Zn/Y atomic ratios with or without artificial cooling (AC) extrusion were systematically investigated in this work. The results show that bimodal microstructure consisting of submicron dynamic recrystallized (DRXed) grains with high fraction of low-angle grain boundaries (LAGBs) and elongated unDRXed grains was formed in Mg98.7Zn1Y0.3 alloy with AC extrusion. The AC process effectively limits the growth of precipitated phases, and large amount of nanoscale precipitates were dynamically precipitated during the extrusion process. AC extrusion could effectually refine the lamellar 14H LPSO phases and inhibit the transition from stacking faults to LSPO phases in Mg98Zn1Y1 alloy and the narrow LPSO phase in Mg98Zn1Y1-AC alloy which could promote the nucleation of DRXed grains. The AC extrusion significantly improves the strength of Mg–Zn–Y alloys. Owing to AC extrusion, the strength improvement of Mg98.7Zn1Y0.3 alloy is mainly attributed to fine grain strengthening, dislocation strengthening, and nano-phases precipitation strengthening. After AC process, more fine grains and nano-phases jointly strengthen the Mg98Zn1Y1 alloy. The Mg98Zn1Y1 alloy obtains optimal mechanical properties after extrusion at 623 K, with ultimate tensile strength (UTS) of 406 MPa, yield strength (YS) of 388 MPa, and elongation (EL) of 5.6%.
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Acknowledgements
This research was financially supported by the National Natural Science Foundation of China (Nos. 52274377 and 52304391), the Natural Science Foundation of Liaoning Province, China (No. 2023-MSBA-133) and the Natural Science Foundation of Inner Mongolia Autonomous Region, China (No. 2022MS05045).
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Liao, QY., Zhao, DZ., Le, QC. et al. Effect of Artificial Cooling Extrusion on Microstructure and Mechanical Properties of Mg–Zn–Y Alloys. Acta Metall. Sin. (Engl. Lett.) (2024). https://doi.org/10.1007/s40195-024-01681-5
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DOI: https://doi.org/10.1007/s40195-024-01681-5