Influence of Extrusion Rate on Evolution of LPSO Phase and Dynamic Recrystallization of Mg-Gd-Y-Zn-Zr Alloys

DU Zelong; ZHANG Zhirou; GUO Enyu; WANG Tongmin

doi:10.3969/j.issn.1674-6457.2026.04.001

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (4) : 1-10. DOI: 10.3969/j.issn.1674-6457.2026.04.001

Light Alloy Forming

Influence of Extrusion Rate on Evolution of LPSO Phase and Dynamic Recrystallization of Mg-Gd-Y-Zn-Zr Alloys

DU Zelong¹, ZHANG Zhirou¹, GUO Enyu^1,2,*, WANG Tongmin^1,2

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Abstract

Aiming at the challenge of poor formability in high-strength magnesium alloys, the work aims to optimize the microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloys by modulating the extrusion rate, so as to provide a new theoretical basis for the thermomechanical processing of high-ductility magnesium alloys. Hot extrusion experiments were conducted at 480 ℃ and 0.1 mm/s and 1 mm/s. The microstructural evolution, second-phase distribution, dynamic recrystallization behavior, and texture characteristics of the extruded samples were examined by optical microscopy, scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. Room-temperature tensile tests were performed to evaluate the mechanical properties. After extrusion, the microstructure consisted of elongated deformed grains and dynamically recrystallized grains. The second phases were distributed in an elongated morphology along grain boundaries, while lamellar LPSO phases were dynamically precipitated within the grains. The degree of their bending deformation significantly increased with the increase of extrusion rate. With the increase of extrusion rate, the volume fraction of dynamic recrystallization increased, leading to a significant decrease in alloy strength, while the elongation was only improved slightly. In conclusion, although increasing the extrusion rate can improve plasticity to a certain extent, it will cause a significant reduction in strength, which is not conducive to the comprehensive mechanical properties of the alloy. The strength and plasticity matching of the alloy is regulated by the extrusion rate which influences the degree of dynamic recrystallization and texture characteristics. Therefore, it is a key technological path to reasonably choose an appropriate extrusion rate for optimizing the strength-plasticity balance of magnesium alloys.

Key words

Mg-Gd-Y-Zn-Zr alloys / LPSO phase / extrusion rate / dynamic recrystallization / mechanical property

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DU Zelong, ZHANG Zhirou, GUO Enyu, WANG Tongmin. Influence of Extrusion Rate on Evolution of LPSO Phase and Dynamic Recrystallization of Mg-Gd-Y-Zn-Zr Alloys[J]. Journal of Netshape Forming Engineering. 2026, 18(4): 1-10 https://doi.org/10.3969/j.issn.1674-6457.2026.04.001

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