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- W4214892004 abstract "The present work focuses on the effects of rare earth (RE = Gd and Er) contents on the microstructural evolution and mechanical performance of Mg-Gd-Er-Zr alloys. Three different alloys, i.e., Mg-12Gd-2Er-0.4Zr, Mg-14Gd-1Er-0.4Zr, and Mg-14Gd-2Er-0.4Zr, are fabricated and subjected to double-pass extrusion. Incomplete dynamic recrystallization (DRX) resulted in a non-homogeneous grain structure with coarse and refined equiaxed grains during single-pass extrusion. In contrast, the grain size decreased dramatically after double-pass extrusion, and a high number of fine Mg5RE particles precipitated in the Mg-14Gd-2Er-0.4Zr alloy than the other two extruded alloys. Moreover, the Mg5RE particles larger than 1 μm contributed to increase the DRX fraction, whereas the finer ones exerted a strong pinning effect on grain boundaries. The volume fraction of β′ precipitates increased with increasing RE content in the matrix. A large volume fraction of β′ precipitates in the alloy will primarily result in higher hardness and strength in the peak-aged condition. After peak-aging treatment, the double-pass extruded Mg-14Gd-2Er-0.4Zr alloy exhibited a good yield strength of 481 ± 3.7 MPa and an adequate elongation of 3.2 ± 0.6%. The influence mechanisms of grain refinement, fine particles, and the strengthening of β′ precipitates are discussed." @default.
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- W4214892004 date "2022-04-01" @default.
- W4214892004 modified "2023-10-16" @default.
- W4214892004 title "Improved mechanical performance of double-pass extruded Mg-Gd-Er-Zr alloys with various rare earth contents" @default.
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- W4214892004 doi "https://doi.org/10.1016/j.msea.2022.142922" @default.
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