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Open AccessArticle

Comparative Study of Hot Deformation Behavior and Microstructure Evolution of As-Cast and Extruded WE43 Magnesium Alloy

1
Guangdong-Hong Kong Joint Research and Development Center on Advanced Manufacturing Technology for Light Alloys; Guangdong Key Laboratory for Technology and Application of Metal Toughening, Guangdong Institute of Materials and Processing, Guangzhou 510650, China
2
College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
3
Hong Kong Institute for Advanced Study; Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong 999077, China
4
Guangdong Xingfa Aluminium Co. Ltd., Foshan 528000, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(4), 429; https://doi.org/10.3390/met10040429
Received: 18 February 2020 / Revised: 18 March 2020 / Accepted: 24 March 2020 / Published: 25 March 2020
Under compressive testing at 400 °C and a strain rate range of 0.05–5 s−1, the hot deformation behavior and microstructure evolution of an as-cast (AC), as-extruded (with a bimodal grain structure (named as Ex-1) or a relatively uniform fine grain structure (Ex-2)) WE43 alloy have been investigated and compared. The results indicate that the AC sample exhibits the highest peak stress, while the Ex-2 sample has the lowest value. Within the AC material, fine grains were firstly formed along the pancake-like deformed grains (as a necklace structure). The necklace structure was also formed within the Ex-1 and Ex-2 materials at high strain rates of 0.5 and 5 s−1. However, a lamellar structure that the coarse elongated grains divided by parallel boundaries was formed within the Ex-1 material. A relatively more homogeneous fine grain structure is achieved after a true strain of 1.0 within the Ex-2 material at a low strain rate of 0.05 s−1. In addition, a discontinuous dynamic recrystallization mechanism by grain boundary bulging is found to occur. After a true strain of 1.2, a (0001) fiber texture, a typical rare earth (RE) texture, and a relatively random texture are formed within the AC, Ex-1, and Ex-2 WE43 alloy material, respectively. View Full-Text
Keywords: WE43 alloy; compressive deformation; deformation behavior; microstructure evolution; texture WE43 alloy; compressive deformation; deformation behavior; microstructure evolution; texture
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Kang, Y.; Huang, Z.; Zhao, H.; Gan, C.; Zhou, N.; Zheng, K.; Zhang, J.; Pan, F.; Huang, J.; Wang, S. Comparative Study of Hot Deformation Behavior and Microstructure Evolution of As-Cast and Extruded WE43 Magnesium Alloy. Metals 2020, 10, 429.

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