Abstract
A magnesium alloy, Mg-8Al-0.5Zn-0.2Ag-0.2Mn (AQ80), was extruded by forward extrusion and twist deformation (FETD) at 370°C with 0% and 6% pre-compression. The effect of pre-compression on microstructure and texture of the AQ80 Mg alloy during FETD was systematically investigated. Compared with the 0% pre-compression FETD-ed sample, the 6% pre-compression FETD-ed sample shows a more uniform and finer microstructure and a weaker texture. The effects of pre-twinning on the microstructure and texture during FETD were also investigated. It was found that many {10–12} tension twins were implanted into the as-cast AQ80 Mg alloy by the 6% pre-compression treatment, providing sufficient nucleation sites for subsequent dynamic recrystallization. Combined with microstructure evolution analysis, it can be concluded that the texture development is strongly influenced by the twinning and basal slip during FETD extrusion.
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Acknowledgements
This work was partly supported by National Natural Science Foundation of China (Grant Nos. 51975207 & 51728202), Hunan Provincial Natural Science Foundation for Excellent Young Scholars of China (Grant No. 2019JJ30010) and the Scientific Research Fund of Hunan Provincial Education Department (Grant No. 17B089). Special thanks to Zhuoran Zeng at Monash University for the helpful discussion and proofreading.
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Liu, X., Lu, L., Sheng, K. et al. Effect of Pre-compression on Microstructure Evolution of AQ80 Magnesium Alloy in Forward Extrusion and Twist Deformation. JOM 71, 4726–4736 (2019). https://doi.org/10.1007/s11837-019-03836-7
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DOI: https://doi.org/10.1007/s11837-019-03836-7