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Journal Article

Effect of pack-forging on microstructure and properties of Mg–Gd–Y–Zn–Zr alloy


Liu,  Chuanlai
Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Wei, X., Jin, L., Liu, C., Wang, F., Dong, S., & Dong, J. (2021). Effect of pack-forging on microstructure and properties of Mg–Gd–Y–Zn–Zr alloy. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 802: 140674. doi:10.1016/j.msea.2020.140674.

Cite as: https://hdl.handle.net/21.11116/0000-0009-7189-D
An ultrahigh strength Mg-10Gd-4Y-1.5Zn-0.5Zr alloy was prepared by the combined process of extrusion, pack-forging and aging treatment. The resultant alloy possesses a bimodal grain structure, a high number density of nanoprecipitates and long period stacking ordered (LPSO)/stacking faults (SFs). Numerous dispersive precipitates formed after the aging treatment due to the high number density of dislocations induced by pack-forging at low forming temperatures. The additional compression stress benefited from the pack-forging accelerates the dynamic dissolution of the LPSO phase and precipitation of SFs. Heterogeneous deformation induced (HDI) strengthening is achieved from the bimodal grain structure and different types of dynamic recrystallization (DRXed) grains, which significantly enhance the yield strength. Besides, grain-boundary strengthening and precipitation strengthening contribute to the high yield strength as well. © 2020