TY - JOUR
T1 - Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy
AU - Gui, Yunwei
AU - Ouyang, Lingxiao
AU - Cui, Yujie
AU - Bian, Huakang
AU - Li, Quanan
AU - Chiba, Akihiko
N1 - Funding Information:
The authors, Quanan Li and Yunwei Gui, are grateful for the financial support from the National Natural Science Foundation of China (Grant no. 51571084 ). Yujie Cui gratefully acknowledge the financial support from the Grant-in-Aid for Early-Career Scientists (Grant no. 18K14024). Yunwei Gui would like to acknowledge financial support from the China Scholarship Council (Grant No. 201908410208).
Publisher Copyright:
© 2020
PY - 2021/3/15
Y1 - 2021/3/15
N2 - 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.
AB - 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.
KW - Continuous dynamic recrystallization (CDRX)
KW - Discontinuous dynamic recrystallization (DDRX)
KW - Grain refinement
KW - Hot indirect extrusion
KW - Magnesium–rare earth (Mg–Re) alloy
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U2 - 10.1016/j.jma.2020.06.001
DO - 10.1016/j.jma.2020.06.001
M3 - Article
AN - SCOPUS:85087129666
VL - 9
SP - 456
EP - 466
JO - Journal of Magnesium and Alloys
JF - Journal of Magnesium and Alloys
SN - 2213-9567
IS - 2
ER -