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<p>The limited ductility of magnesium alloys at ambient temperature is primarily attributed to the restricted activation of slip modes, which leads to a pronounced basal plane texture. To overcome this issue, high-performance AZ31 magnesium sheets were fabricated using a specially designed hard plate accumulative roll bonding (HP-ARB) process. In contrast to conventional Accumulative Roll Bonding (ARB) studies, this work uniquely combines HP-ARB with in-situ electron backscatter diffraction (EBSD), enabling direct tracking of twinning–slip interactions during tensile deformation. Thus, the deformation behavior of AZ31 magnesium alloy sheets treated with HP-ARB under uniaxial stretching at room temperature was studied to clarify the mechanism of enhanced sheet performance. The results demonstrate that the HP-ARB technique effectively reduces the average grain size to 4.23 ± 0.28 <i>μ</i>m, achieves an ultimate tensile strength of 312.6 MPa, and results in an elongation of ~&#xa0;9.7 pct. These improvements significantly enhance the mechanical properties of the material. During the tensile deformation of the rolled magnesium sheets, at low strain levels, the plastic deformation of the grain c-axis is facilitated by the formation of {10-12} tension twins and secondary twins, which delays plastic fracture and improves ductility. At higher strain levels, the activation of non-basal slip systems increases, thereby diminishing the strong basal plane texture and achieving an optimal combination of strength and ductility. These findings highlight the novelty of integrating in-situ EBSD with HP-ARB and demonstrate a clear pathway to achieve simultaneous grain refinement, twin–slip synergy, and superior strength–ductility balance in magnesium alloys.</p> Graphical abstract <p></p>

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In-Situ Stretched Characterization of Twins and Slip Synergistic Mechanisms in AZ31 Magnesium Alloy Sheets via Hard Plate Accumulative Roll Bonding

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Hai Bo Wang,
  • Feng Li,
  • Lu Sun,
  • Wen Tao Niu,
  • Jia Yang Zhang

摘要

The limited ductility of magnesium alloys at ambient temperature is primarily attributed to the restricted activation of slip modes, which leads to a pronounced basal plane texture. To overcome this issue, high-performance AZ31 magnesium sheets were fabricated using a specially designed hard plate accumulative roll bonding (HP-ARB) process. In contrast to conventional Accumulative Roll Bonding (ARB) studies, this work uniquely combines HP-ARB with in-situ electron backscatter diffraction (EBSD), enabling direct tracking of twinning–slip interactions during tensile deformation. Thus, the deformation behavior of AZ31 magnesium alloy sheets treated with HP-ARB under uniaxial stretching at room temperature was studied to clarify the mechanism of enhanced sheet performance. The results demonstrate that the HP-ARB technique effectively reduces the average grain size to 4.23 ± 0.28 μm, achieves an ultimate tensile strength of 312.6 MPa, and results in an elongation of ~ 9.7 pct. These improvements significantly enhance the mechanical properties of the material. During the tensile deformation of the rolled magnesium sheets, at low strain levels, the plastic deformation of the grain c-axis is facilitated by the formation of {10-12} tension twins and secondary twins, which delays plastic fracture and improves ductility. At higher strain levels, the activation of non-basal slip systems increases, thereby diminishing the strong basal plane texture and achieving an optimal combination of strength and ductility. These findings highlight the novelty of integrating in-situ EBSD with HP-ARB and demonstrate a clear pathway to achieve simultaneous grain refinement, twin–slip synergy, and superior strength–ductility balance in magnesium alloys.

Graphical abstract