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Recrystallization Behavior and Texture Evolution of Magnesium Alloy Bending Products under Staggered Extrusion

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Abstract

The use of lightweight arc-shaped products is one of the effective ways to realize the lightweight of material and structure. Staggered extrusion (SE) is a new method for short process forming of arc-shaped materials. Due to step-like stem, it has an important influence on extrusion flow behavior and microstructure. Herein, the AZ31 magnesium alloy microstructure evolution during the SE is focused on. By means of metallographic microstructure analysis and electron backscatter diffraction, the microstructure of bending products with staggered distance h of 16 mm and extrusion ratio of 11.11 was analyzed. The results show that with the change of stem structure, the order and amount of shear deformation change at each part, resulting in the difference of average grain size. Compared with the initial billet, the average grain size is refined from 68.38 to 17.15 μm. Complete dynamic recrystallization takes place to form fine and uniform grains. Basal texture {0001} tends to be perpendicular to the extrusion direction (ED) in regions A, B and C. The texture of region A in forward extrusion is shifted counterclockwise, and that of regions B and C in backward extrusion is shifted clockwise. However, the texture in the region D turns parallel to the ED, but there is a small deflection angle α. It provides scientific guidance for the shape control and precision manufacturing of high-quality arc-shaped products.

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Acknowledgment

This project is supported by the National Natural Science Foundation of China (Grant No. 51975166).

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Authors and Affiliations

  1. School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150040, People’s Republic of China

    Xi Jie Zhang, Feng Li, Ye Wang & Chao Li

  2. Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China

    Feng Li

  3. South Technology and Engineering Research Institute, Chongqing, 400039, People’s Republic of China

    Xing Mao Xiao

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  1. Xi Jie Zhang
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  2. Feng Li
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  3. Ye Wang
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  4. Chao Li
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Correspondence to Feng Li.

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Zhang, X., Li, F., Wang, Y. et al. Recrystallization Behavior and Texture Evolution of Magnesium Alloy Bending Products under Staggered Extrusion. J. of Materi Eng and Perform 30, 8108–8116 (2021). https://doi.org/10.1007/s11665-021-06056-w

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  • DOI: https://doi.org/10.1007/s11665-021-06056-w

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