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High ductility induced by un-DRXed grains in a Mg–Zn–Mn–La–Ce alloy

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Abstract

An approach of achieving high ductility as well as respectable high strength for low-Zn-containing wrought Mg alloy is presented in this paper. A low-cost and industry-compatible Mg–2Zn–0.3Mn–0.2La–0.1Ce alloy with highest yield strength (YS) of 289 MPa, ultimate tensile strength (UTS) of 300 MPa and excellent elongation (EL) of 32.7% is developed by traditional indirect extrusion. The microstructure and macro-textures of this alloy under various extrusion temperatures are characterized by OM, EBSD and XRD analysis. High quantity of dispersed elongated un-DRXed grains with various orientations form at relatively low extrusion temperatures, and many of them possess high basal Schmidt Factors (SFs) toward transverse directions. TEM analysis reveals a large number of networked dislocations passing through the deformation bands along transverse directions within the un-DRXed grains, which suggests the integral deformation (bending) is achievable by dislocation motion. It is believed that the high ductility along extrusion direction is induced by the bendable elongated un-DRXed grains during tensile deformation by embodying the easy-to-failure regions, preventing the subsequent generation of micro-cracks and accommodating the stress concentration.

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Acknowledgements

The authors are also grateful for the co-support by HENAN JIEMEITE MAGNESIUM TECHNOLOGY CO., LTD. This research was financially supported by the National Key Research and Development Program of China [2016YFB0301104] and National Natural Science Foundation of China [51771043].

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Authors and Affiliations

  1. Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang, 110819, People’s Republic of China

    Ke Hu, Qiyu Liao, Chunyu Li, Qichi Le, Weiyang Zhou, Chunlong Cheng, Shaochen Ning & Xingrui Chen

  2. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, People’s Republic of China

    Fuxiao Yu

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  1. Ke Hu
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Correspondence to Qichi Le.

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Hu, K., Liao, Q., Li, C. et al. High ductility induced by un-DRXed grains in a Mg–Zn–Mn–La–Ce alloy. J Mater Sci 54, 10902–10917 (2019). https://doi.org/10.1007/s10853-019-03624-3

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