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<p>In this study, accumulative roll bonding (ARB) experiments were conducted on an Mg-2Al-0.5Ca alloy at 280 °C. The microstructure and mechanical properties of AX20 magnesium alloy plates subjected to varying rolling passes were systematically characterized. The evolution of the deformation mechanisms was analyzed using Finite Element Method (FEM) in conjunction with Visco-Plastic Self-Consistent (VPSC) polycrystal modeling. The results reveal that the composite material achieved a yield strength (YS) of 269.79 MPa and an ultimate tensile strength (UTS) of 323.67 MPa following the sixth cycle, representing enhancements of 60.59% and 54.91%, respectively, over the matrix material. However, a significant decrease in plasticity was observed, with elongation (EL) reduced to 5.24% compared to the matrix. The analysis attributes the strength improvement of the alloy to mechanisms such as fine grain strengthening, dislocation strengthening, and second phase strengthening. Moreover, the uniform distribution of the bimodal microstructure contributes positively to the back stress strengthening effect. Simulations indicate that basal &lt; a &gt; slip serves as the predominant deformation mechanism during the ARB process, while the activation of pyramidal &lt; c + a &gt; slip progressively increases, facilitating and coordinating the overall deformation. This provides a new reference for the forming and manufacture of high-performance magnesium alloy sheets.</p>

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Effect of the Accumulative Roll Bonding on the Deformation Mechanism Evolution and Mechanical Properties of Mg-Al-Ca Alloys: Coupled Experiments and FEM-VPSC

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Siyu Pan,
  • Ling Shan,
  • Ming Chen,
  • Wenbo Luo,
  • Haoyu Shi,
  • Wanshun Zhang,
  • Tao Jiang,
  • Hongyang Zhao,
  • Dongying Ju

摘要

In this study, accumulative roll bonding (ARB) experiments were conducted on an Mg-2Al-0.5Ca alloy at 280 °C. The microstructure and mechanical properties of AX20 magnesium alloy plates subjected to varying rolling passes were systematically characterized. The evolution of the deformation mechanisms was analyzed using Finite Element Method (FEM) in conjunction with Visco-Plastic Self-Consistent (VPSC) polycrystal modeling. The results reveal that the composite material achieved a yield strength (YS) of 269.79 MPa and an ultimate tensile strength (UTS) of 323.67 MPa following the sixth cycle, representing enhancements of 60.59% and 54.91%, respectively, over the matrix material. However, a significant decrease in plasticity was observed, with elongation (EL) reduced to 5.24% compared to the matrix. The analysis attributes the strength improvement of the alloy to mechanisms such as fine grain strengthening, dislocation strengthening, and second phase strengthening. Moreover, the uniform distribution of the bimodal microstructure contributes positively to the back stress strengthening effect. Simulations indicate that basal < a > slip serves as the predominant deformation mechanism during the ARB process, while the activation of pyramidal < c + a > slip progressively increases, facilitating and coordinating the overall deformation. This provides a new reference for the forming and manufacture of high-performance magnesium alloy sheets.