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<p>This article systematically investigates the influence of rotation cycles on the microstructure and hardness of Mg–12.122Gd–4.2Y–2.28Zn–0.36Zr (wt%) alloy during rotary backward extrusion (RBE) process. In depth exploration of grain refinement mechanisms and texture evolution in different deformation Areas. The results show that the deformed sample exhibits a clear gradient microstructure, and the grain refinement mechanism gradually transitions from the RDRX mechanism in II Area to the high dislocation density dominated by the coordinated deformation of the second phase and high solute concentration. With increasing rotation cycles, the affected Area progressively expands, inducing significant variations in grain refinement degree, non-equilibrium solid solution behavior, and texture characteristics. The grain size evolution in different deformation Areas is primarily governed by sub-grain size and their area fractions, attributable to the high dislocation density characteristic of RBE processing. An inverse dynamic correlation persists between sub-grain size and dislocation density, with distinct dislocation multiplication behaviors observed across Areas as rotation cycles increase. Texture analysis reveals that II Area develops an anomalous [0001] ∥ ED texture dominated by pyramidal slip, while III and IV Area form typical basal double-peak textures controlled by prismatic slip. Hardness measurements show a progressive increase from I to IV Area, with IV Area reaching 123.1 HV after 100 cycles—a synergistic effect of grain refinement, dislocation, second-phase, and solid solution strengthening. Further deformation cycles slightly enhance IV Area hardness through intensified solid solution effects.</p> Graphical Abstract <p></p>

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Effects of the Deformation Cycles on the Microstructure, Texture and Hardness of Mg–Gd–Y–Zn–Zr Alloy During Rotational Extrusion Deformation

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Mei Cheng,
  • Guoqin Wu,
  • Yue Zhao,
  • Dongliang Lu,
  • Renyuan Lu,
  • Jianmin Yu

摘要

This article systematically investigates the influence of rotation cycles on the microstructure and hardness of Mg–12.122Gd–4.2Y–2.28Zn–0.36Zr (wt%) alloy during rotary backward extrusion (RBE) process. In depth exploration of grain refinement mechanisms and texture evolution in different deformation Areas. The results show that the deformed sample exhibits a clear gradient microstructure, and the grain refinement mechanism gradually transitions from the RDRX mechanism in II Area to the high dislocation density dominated by the coordinated deformation of the second phase and high solute concentration. With increasing rotation cycles, the affected Area progressively expands, inducing significant variations in grain refinement degree, non-equilibrium solid solution behavior, and texture characteristics. The grain size evolution in different deformation Areas is primarily governed by sub-grain size and their area fractions, attributable to the high dislocation density characteristic of RBE processing. An inverse dynamic correlation persists between sub-grain size and dislocation density, with distinct dislocation multiplication behaviors observed across Areas as rotation cycles increase. Texture analysis reveals that II Area develops an anomalous [0001] ∥ ED texture dominated by pyramidal slip, while III and IV Area form typical basal double-peak textures controlled by prismatic slip. Hardness measurements show a progressive increase from I to IV Area, with IV Area reaching 123.1 HV after 100 cycles—a synergistic effect of grain refinement, dislocation, second-phase, and solid solution strengthening. Further deformation cycles slightly enhance IV Area hardness through intensified solid solution effects.

Graphical Abstract