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Microstructure Evolution and Deformation Behavior of AZ31 Magnesium Alloy During Alternate Forward Extrusion

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The paper presents a new extrusion method, alternate forward extrusion, in which the punch was replaced with double-split structures so as to achieve the grain refinement for material near the interface of double-split structures. The results showed that the unique loading mode made metal flow sequence and behavior significantly changed during alternate forward extrusion. The additional shear deformation produced by the double-split punch structures resulted in a refining effect on the microstructure of the blank, which was then further refined during flow through the die orifice owing to shear deformation. Compared with the conventional extrusion, the recrystallization process in the alternate forward extrusion process produced grains that were smaller and more homogeneous in size. The recrystallization process was more abundant, and the dislocation density was significantly increased. It can be concluded that the alternate forward extrusion process could achieve fine-grained strengthening, which provided technical support and scientific guidance for the engineering application of magnesium alloy extrusion forming technology.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51675143).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Feng Li, Yang Liu & Xubo Li

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  1. Feng Li
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  2. Yang Liu
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  3. Xubo Li
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Correspondence to Feng Li.

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Available online at http://link.springer.com/journal/40195

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Li, F., Liu, Y. & Li, X. Microstructure Evolution and Deformation Behavior of AZ31 Magnesium Alloy During Alternate Forward Extrusion. Acta Metall. Sin. (Engl. Lett.) 30, 1135–1144 (2017). https://doi.org/10.1007/s40195-017-0654-8

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  • DOI: https://doi.org/10.1007/s40195-017-0654-8

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