Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy

We utilized electron backscatter diffraction to investigate the microstructure evolutions of a newly developed magnesium-rare earth alloy (Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr) during instantaneous hot indirect extrusion. An equiaxed fine-grained (average grain size of 3.4 ± 0.2 µm) microstructure with a w...

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Main Authors: Yunwei Gui, Lingxiao Ouyang, Yujie Cui, Huakang Bian, Quanan Li, Akihiko Chiba
Format: Article
Language:English
Published: KeAi Communications Co., Ltd. 2021-03-01
Series:Journal of Magnesium and Alloys
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2213956720300955
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spelling doaj-06058d8667324a5c830ee1f1a9a4d6f72021-04-18T06:27:14ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672021-03-0192456466Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloyYunwei Gui0Lingxiao Ouyang1Yujie Cui2Huakang Bian3Quanan Li4Akihiko Chiba5Department of Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, JapanDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, JapanInstitute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan; Corresponding author.Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JapanSchool of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China; Collaborative Innovation Center of Nonferrous Metals, Henan Province, Luoyang 471023, ChinaInstitute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JapanWe utilized electron backscatter diffraction to investigate the microstructure evolutions of a newly developed magnesium-rare earth alloy (Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr) during instantaneous hot indirect extrusion. An equiaxed fine-grained (average grain size of 3.4 ± 0.2 µm) microstructure with a weak texture was obtained. The grain refinement was mainly attributed to the discontinuous dynamic recrystallization (DDRX) and continuous DRX (CDRX) processes during the hot indirect extrusion process. The twin boundaries formed during the initial deformation stage effectively increased the number of high angle grain boundaries (HAGBs), which provided sites for new grain nuclei, and hence, resulted in an improved DDRX process. Along with DDRX, CDRX processes characterized by low angle grain boundary (LAGB) networks were also observed in the grain interior due to effective dynamic recovery (DRV) at a relatively high temperature of 773 K and high strain rates. Thereafter, LAGB networks were transformed into HAGB networks by the progressive rotation of subgrains during the CDRX process.http://www.sciencedirect.com/science/article/pii/S2213956720300955Magnesium–rare earth (Mg–Re) alloyGrain refinementDiscontinuous dynamic recrystallization (DDRX)Continuous dynamic recrystallization (CDRX)Hot indirect extrusion
collection DOAJ
language English
format Article
sources DOAJ
author Yunwei Gui
Lingxiao Ouyang
Yujie Cui
Huakang Bian
Quanan Li
Akihiko Chiba
spellingShingle Yunwei Gui
Lingxiao Ouyang
Yujie Cui
Huakang Bian
Quanan Li
Akihiko Chiba
Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy
Journal of Magnesium and Alloys
Magnesium–rare earth (Mg–Re) alloy
Grain refinement
Discontinuous dynamic recrystallization (DDRX)
Continuous dynamic recrystallization (CDRX)
Hot indirect extrusion
author_facet Yunwei Gui
Lingxiao Ouyang
Yujie Cui
Huakang Bian
Quanan Li
Akihiko Chiba
author_sort Yunwei Gui
title Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy
title_short Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy
title_full Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy
title_fullStr Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy
title_full_unstemmed Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy
title_sort grain refinement and weak-textured structures based on the dynamic recrystallization of mg–9.80gd–3.78y–1.12sm–0.48zr alloy
publisher KeAi Communications Co., Ltd.
series Journal of Magnesium and Alloys
issn 2213-9567
publishDate 2021-03-01
description We utilized electron backscatter diffraction to investigate the microstructure evolutions of a newly developed magnesium-rare earth alloy (Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr) during instantaneous hot indirect extrusion. An equiaxed fine-grained (average grain size of 3.4 ± 0.2 µm) microstructure with a weak texture was obtained. The grain refinement was mainly attributed to the discontinuous dynamic recrystallization (DDRX) and continuous DRX (CDRX) processes during the hot indirect extrusion process. The twin boundaries formed during the initial deformation stage effectively increased the number of high angle grain boundaries (HAGBs), which provided sites for new grain nuclei, and hence, resulted in an improved DDRX process. Along with DDRX, CDRX processes characterized by low angle grain boundary (LAGB) networks were also observed in the grain interior due to effective dynamic recovery (DRV) at a relatively high temperature of 773 K and high strain rates. Thereafter, LAGB networks were transformed into HAGB networks by the progressive rotation of subgrains during the CDRX process.
topic Magnesium–rare earth (Mg–Re) alloy
Grain refinement
Discontinuous dynamic recrystallization (DDRX)
Continuous dynamic recrystallization (CDRX)
Hot indirect extrusion
url http://www.sciencedirect.com/science/article/pii/S2213956720300955
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