Abstract
Significant tension-compression (T–C) yield asymmetry in common wrought Mg alloys hinders their widespread applications. A double extrusion process with variable speed and partially substituted yttrium (Y) (2 wt%) for Sn was proposed to improve the T–C asymmetry of Mg–2.5Sn (wt%) alloy, and then to explore the critical grain size parameter for T–C symmetry. The result showed that the individual double extrusion or partial substitution of Sn by Y slightly refined the grains of Mg–2.5Sn alloy (from ~ 42.5 µm to 35.5 µm and 31.2 µm, respectively), along with the improved T–C asymmetry (CYS/TYS) from 0.44 to 0.51 and 0.75, respectively. When combining the above two factors, the double-extruded Mg–Sn–Y alloys obtained fine grains with ~ 8.8 µm and gained a T–C yield symmetry (CYS/TYS = 1.01). By tailoring the extrusion speed from the previous 1.2 mm/s to 2 mm/s, the grain size of double-extruded Mg–Sn–Y further deduced to ~ 5.6 µm and turned to be a reversed T–C asymmetry (CYS/TYS) of 1.37. The refined grain size combined with weakened texture led to a decreased activation or even inhibition of tension twinning and increased activation of non-basal slip, which might be the main reason for the improved or even reversed T–C asymmetry in double-extruded Mg–0.5Sn–2Y.
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Acknowledgments
The authors gratefully acknowledge the National Natural Science Foundation of China (52004227, 52171125 and U1764253), Jihua Laboratory and GuangDong Basic and Applied Basic Research Foundation (2020A1515110262), Fundamental Research Funds for the Central Universities (2682020ZT114), and the Fundamental Research Funds for Southwest Jiaotong University (2682021ZTPY001). We also thank the Analytical and Testing Center of Southwest Jiaotong University for assistance with EBSD experiments.
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Zeng, Y., Xiong, X., Qian, X. et al. Achieving Improved/Reversed Tension–Compression Asymmetry by Tailoring Extrusion Processing for Mg–Sn(–Y) Alloy. Met. Mater. Int. 29, 1885–1895 (2023). https://doi.org/10.1007/s12540-022-01357-8
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DOI: https://doi.org/10.1007/s12540-022-01357-8