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Mechanism of Ductility Enhancement of the Mg-8Gd-4Y-1Nd-0.5Si Alloy by Multi-Directional Forging Process before Extrusion

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Abstract

Noteworthy ductility Mg-8Gd-4Y-1Nd-0.5Si (wt.%) alloy with a strong non-basal texture was developed by 12 passes of multi-directional forging (MDF) combine with extrusion. The slip trace analysis indicated that deformation mechanism after 3 passes of MDF and extrusion were basal < a > , pyramidal < a > and pyramidal < c + a > slips. The intensity of non-basal texture increased from 5.37 to 8.03 with the MDF passes increased from 3 to 12, which means grain orientation tends to be more consistent and makes the basal < a > slips easy to pass through grain boundaries to accommodate ductility. With more basal < a > slips crossing the grain boundaries, dislocation interaction in grain interior caused stress accumulation, exceeding the critical shear stress (CRSS) of slips with low schmidt factor (SF), and multiple slips appeared. The activation of slip cross grain boundary and multiple slip improved the elongation from 14.7% to 25.6% of MDFs-extruded Mg-8Gd-4Y-1Nd-0.5Si alloy.

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Acknowledgements

The authors gratefully acknowledge National key R & D projects (Project No. 2021YFB3501002) and the Equipment Advance Study Project (Project No. 41422010705). Laboratory stability support funding was obtained from the National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, People’s Republic of China

    Yunlai Deng & **aobin Guo

  2. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha, 410083, People’s Republic of China

    Yunlai Deng

  3. Light Alloy Research Institute, Central South University, Changsha, 410083, People’s Republic of China

    Manfa Yuan & ** Zhang

  4. Institute of Intelligent Manufacturing, Suzhou Jianxiong Vocational and Technical College, Suzhou, 215400, People’s Republic of China

    Liqun Guan

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  1. Manfa Yuan
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Correspondence to **aobin Guo.

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Yuan, M., Zhang, J., Deng, Y. et al. Mechanism of Ductility Enhancement of the Mg-8Gd-4Y-1Nd-0.5Si Alloy by Multi-Directional Forging Process before Extrusion. Met. Mater. Int. 29, 1323–1333 (2023). https://doi.org/10.1007/s12540-022-01310-9

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