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<p>Magnesium alloys are promising lightweight materials but suffer from poor room-temperature plasticity due to their hexagonal close-packed structure. This study investigated the effects of low-frequency vibration parameters (amplitude and frequency) on the mechanical behavior, microstructure evolution, and fracture characteristics of AZ31B-H24 magnesium alloy during tension. Results showed that low-frequency vibration induced periodic flow stress fluctuations via the stress superposition effect, with the stress fluctuation amplitude increasing with amplitude but remaining insensitive to 10–30&#xa0;Hz frequency variations. A vibration hardening effect was observed, and the hardening value positively correlates with amplitude. An optimal amplitude of 0.075&#xa0;mm at 20&#xa0;Hz maximized the average fracture elongation, achieving a 30.69% increase compared to quasi-static tension. Conversely, a negative correlation existed between amplitude and microhardness, with hardness decreasing by 15.5% as amplitude increased from 0 to 0.1&#xa0;mm. Fractography revealed a transition toward a more ductile morphology under low-frequency vibration-assisted tensile (LFVT) test, characterized by a higher density of deeper dimples and reduced cleavage facets compared to quasi-static fractures. Microstructural analysis demonstrated that LFVT promoted dislocation annihilation, reducing geometrically necessary dislocation (GND) density. In addition, the vibration facilitated grain rotation during deformation, orienting grains toward more deformation-favorable orientations. Low-frequency vibration-assisted forming technique contributes to enhancing the deep drawability and complex structural forming capability of magnesium alloy sheets. In fields with high requirements for lightweighting and component integration, this technology demonstrates promising application prospects.</p>

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Study on Mechanical Behavior and Microstructure Evolution of AZ31B-H24 Magnesium Alloy via Low-Frequency Vibration-Assisted Tension

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Ye Tian,
  • Qi Li,
  • Wen Zhang,
  • Xincun Zhuang,
  • Zhen Zhao

摘要

Magnesium alloys are promising lightweight materials but suffer from poor room-temperature plasticity due to their hexagonal close-packed structure. This study investigated the effects of low-frequency vibration parameters (amplitude and frequency) on the mechanical behavior, microstructure evolution, and fracture characteristics of AZ31B-H24 magnesium alloy during tension. Results showed that low-frequency vibration induced periodic flow stress fluctuations via the stress superposition effect, with the stress fluctuation amplitude increasing with amplitude but remaining insensitive to 10–30 Hz frequency variations. A vibration hardening effect was observed, and the hardening value positively correlates with amplitude. An optimal amplitude of 0.075 mm at 20 Hz maximized the average fracture elongation, achieving a 30.69% increase compared to quasi-static tension. Conversely, a negative correlation existed between amplitude and microhardness, with hardness decreasing by 15.5% as amplitude increased from 0 to 0.1 mm. Fractography revealed a transition toward a more ductile morphology under low-frequency vibration-assisted tensile (LFVT) test, characterized by a higher density of deeper dimples and reduced cleavage facets compared to quasi-static fractures. Microstructural analysis demonstrated that LFVT promoted dislocation annihilation, reducing geometrically necessary dislocation (GND) density. In addition, the vibration facilitated grain rotation during deformation, orienting grains toward more deformation-favorable orientations. Low-frequency vibration-assisted forming technique contributes to enhancing the deep drawability and complex structural forming capability of magnesium alloy sheets. In fields with high requirements for lightweighting and component integration, this technology demonstrates promising application prospects.