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Modification of grain refinement and texture based on pre-upsetting AZ31 Mg alloy in interactive alternating forward extrusion

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Abstract

Reducing energy consumption and exploring the potential of materials in depth is a long-term pursuit of goals and development directions in the field of extrusion technology. If load reduction and material performance can be achieved at the same time, this is a good strategy to solve the bottleneck. For the first time, a pre-upsetting technique was used before alternating extrusion in this investigation, which enhances grain refinement and increases the Schmid factor. This reduced the single grain yield strength and the load of the second process. The results of comparative research show that compared with interactive alternating forward extrusion (AFE), pre-upsetting alternate forward extrusion (UAFE) can significantly reduce the peak load required for forming, which increases the tensile strength of extruded AZ31 magnesium alloy products by 41.9% and the ductility to 23.7%. The average grain size was only 1/2 of the conventional alternating extrusion grain size, and the strength of the texture was weakened to 8.62. The increase in tensile strength is mainly due to fine-grained strengthening. Grain boundaries can hinder dislocation movement. Some grains are inclined from the original typical fiber texture to the ED direction during pre-upsetting, which effectively reduces the texture strength of UAFE and increases the ductility of the material. This provides scientific guidance and technical support for the development and application of high-performance magnesium alloy extrusion forming technology.

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Acknowledgements

This project is supported by the National Natural Science Foundation of China (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

    Hua Qiu Du, Feng Li, Ye Wang, Chao Li & Zi Yu Chen

  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

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  1. Hua Qiu Du
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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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New extrusion technology is currently a hot research direction in the field of plastic processing. A predeformation alternating extrusion process was proposed in this paper, which can provide a new idea for the preparation of high-performance magnesium alloy.

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Correspondence to Feng Li or Ye Wang.

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Du, H.Q., Li, F., Wang, Y. et al. Modification of grain refinement and texture based on pre-upsetting AZ31 Mg alloy in interactive alternating forward extrusion. Int J Adv Manuf Technol 121, 4805–4815 (2022). https://doi.org/10.1007/s00170-022-09684-1

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