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<p>The present study explores the impact of different rolling reductions on the microstructural and mechanical evolution of extruded Mg-1Gd sheets. The microstructural parameters, such as grain size, texture distribution, and misorientation angle, from the extruded state through different rolling reductions were characterized using electron backscattered diffraction (EBSD). Increasing the rolling reduction progressively refined the grain structure of the extruded sheets, leading to a significant improvement in mechanical properties. An extrusion direction (ED)-split texture was presented in the extruded Mg-1Gd sheet. Increasing the rolling reduction gradually reduced the split angle from ± 52° to ± 35°. Concurrently, higher rolling reductions promote a greater density of deformed grain regions, inducing progressively higher dislocation accumulation. The rise in yield strength (σ<sub>0.2,</sub> tension along ED) with thickness reduction is predominantly attributed to grain refinement, reduced average Schmidt factor of basal slip (m<sub>basal</sub>), and high-density dislocation. However, the enhanced σ<sub>0.2</sub> (tension along transverse direction, TD) derives solely from finer grain strengthening and dislocation hardening effects. Ductility deterioration during ED tension originates in the texture configuration produced at 10% rolling reduction. Conversely, ductility improves at higher reductions primarily owing to grain refinement and increased low-angle grain boundary density.</p>

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Impact of Rolling Reduction on the Microstructural Evolution and Mechanical Behavior of Mg-1Gd Alloy

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Jun Zhao,
  • Puchen Zhang,
  • Bingchun Jiang,
  • Jinglu Li,
  • Jiabao Mi,
  • Yanfu Chai,
  • Qinghang Wang

摘要

The present study explores the impact of different rolling reductions on the microstructural and mechanical evolution of extruded Mg-1Gd sheets. The microstructural parameters, such as grain size, texture distribution, and misorientation angle, from the extruded state through different rolling reductions were characterized using electron backscattered diffraction (EBSD). Increasing the rolling reduction progressively refined the grain structure of the extruded sheets, leading to a significant improvement in mechanical properties. An extrusion direction (ED)-split texture was presented in the extruded Mg-1Gd sheet. Increasing the rolling reduction gradually reduced the split angle from ± 52° to ± 35°. Concurrently, higher rolling reductions promote a greater density of deformed grain regions, inducing progressively higher dislocation accumulation. The rise in yield strength (σ0.2, tension along ED) with thickness reduction is predominantly attributed to grain refinement, reduced average Schmidt factor of basal slip (mbasal), and high-density dislocation. However, the enhanced σ0.2 (tension along transverse direction, TD) derives solely from finer grain strengthening and dislocation hardening effects. Ductility deterioration during ED tension originates in the texture configuration produced at 10% rolling reduction. Conversely, ductility improves at higher reductions primarily owing to grain refinement and increased low-angle grain boundary density.