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<p>The influence of rolling direction, roll offset and annealing treatment on the rolling formability, microstructure and mechanical properties of AZ31 alloy has been explored by optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and room temperature tensile tests. The experimental results show that different rolling modes lead to distinct mechanical property characteristics of the alloy, where offset rolling effectively improves the strength and weakens the deformation texture intensity of AZ31 alloy and reverse rolling is more favorable for the enhancement of elongation. The reverse offset-rolled AZ31 alloy (alloy D) prepared by six-pass rolling with inter-pass annealing achieves the optimal strength performance among the as-rolled samples, with an ultimate tensile strength of 378&#xa0;MPa, a yield strength of 298&#xa0;MPa and an elongation of 5.2%. Post-rolling annealing significantly regulates the microstructure of the rolled alloys, as a short-time annealing for 5&#xa0;min at 200&#xa0;°C makes the massive thin deformation twins in the four rolled alloys disappear rapidly and new recrystallized grains form via static recrystallization, thus realizing the homogenization and refinement of the alloy microstructure. With the extension of annealing time, the ductility of the alloys is further improved remarkably, and the reverse offset-rolled alloy D annealed at 200&#xa0;°C for 30&#xa0;min exhibits an elongation increased to 33% while still maintaining excellent strength, with an ultimate tensile strength of 333&#xa0;MPa and a yield strength of 241&#xa0;MPa. In addition, TEM observation further reveals the evolution law of twin microstructure in the rolled alloy matrix and clarifies the intrinsic mechanism of annealing regulating the microstructure and mechanical properties of AZ31 alloy under different rolling modes.</p>

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Investigation of Microstructure and Mechanical Properties of AZ31 Alloy During Offset Rolling with Inter-pass Annealing

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Chi Liu,
  • Yiping Wu,
  • Yuan Xiong,
  • Yichao Wu,
  • Long Yin,
  • Hangling Liu

摘要

The influence of rolling direction, roll offset and annealing treatment on the rolling formability, microstructure and mechanical properties of AZ31 alloy has been explored by optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and room temperature tensile tests. The experimental results show that different rolling modes lead to distinct mechanical property characteristics of the alloy, where offset rolling effectively improves the strength and weakens the deformation texture intensity of AZ31 alloy and reverse rolling is more favorable for the enhancement of elongation. The reverse offset-rolled AZ31 alloy (alloy D) prepared by six-pass rolling with inter-pass annealing achieves the optimal strength performance among the as-rolled samples, with an ultimate tensile strength of 378 MPa, a yield strength of 298 MPa and an elongation of 5.2%. Post-rolling annealing significantly regulates the microstructure of the rolled alloys, as a short-time annealing for 5 min at 200 °C makes the massive thin deformation twins in the four rolled alloys disappear rapidly and new recrystallized grains form via static recrystallization, thus realizing the homogenization and refinement of the alloy microstructure. With the extension of annealing time, the ductility of the alloys is further improved remarkably, and the reverse offset-rolled alloy D annealed at 200 °C for 30 min exhibits an elongation increased to 33% while still maintaining excellent strength, with an ultimate tensile strength of 333 MPa and a yield strength of 241 MPa. In addition, TEM observation further reveals the evolution law of twin microstructure in the rolled alloy matrix and clarifies the intrinsic mechanism of annealing regulating the microstructure and mechanical properties of AZ31 alloy under different rolling modes.