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Effect of Isothermal Repetitive Upsetting Extrusion on the Microstructure of Mg-12.0Gd-4.5Y-2.0Zn-0.4Zr Alloy

School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Author to whom correspondence should be addressed.
Materials 2018, 11(11), 2092;
Received: 7 October 2018 / Revised: 18 October 2018 / Accepted: 22 October 2018 / Published: 25 October 2018
PDF [15258 KB, uploaded 25 October 2018]


Repetitive upsetting extrusion (RUE) was applied to the as-homogenized Mg-12.0Gd-4.5Y-2Zn-0.4Zr (wt %) alloy at 773 K. The microstructure evolution of the alloy during RUE was investigated. The results indicated that almost all Mg5(Gd,Y,Zn) phases and fine-lamellar long-period stacking-ordered (LPSO) phases were dissolved into the matrix after homogenization treatment at 793 K for 16 h. After one RUE pass, dynamic recrystallization (DRX) occurred. During subsequent RUE passes (from one to three passes), average volume fractions of DRXed grains increased from 43.9% to 65.8%, and that of fine-lamellar and block-shaped LPSO phases gradually decreased. All samples exhibited a typical bimodal microstructure consisting of some initial grains containing fine-lamellar LPSO phases, but consisting mostly of fine-DRXed grains with a mean grain size of 6 μm. Because of an increase in the accumulated strains, the coarse grains were substituted with fine-DRXed grains, the grains were gradually refined, and the microstructure distribution became more homogeneous. View Full-Text
Keywords: Mg-Gd-Y-Zn-Zr alloy; RUE; microstructure; DRX Mg-Gd-Y-Zn-Zr alloy; RUE; microstructure; DRX

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Zhang, G.; Zhang, Z.; Du, Y.; Yan, Z.; Che, X. Effect of Isothermal Repetitive Upsetting Extrusion on the Microstructure of Mg-12.0Gd-4.5Y-2.0Zn-0.4Zr Alloy. Materials 2018, 11, 2092.

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