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<p>Magnesium alloys, the lightest engineering materials, are widely applied in aerospace, military armaments, rail transportation, and 3C products; however, their hexagonal close-packed (HCP) crystal structure renders them highly sensitive to fatigue loading, making the investigation of their fatigue characteristics imperative. In recent years, scholars at home and abroad have achieved notable progress in fatigue research on magnesium alloys, and since strain amplitude and loading frequency are two key factors influencing low-cycle fatigue (LCF) behavior, this study employed as-extruded ZK60 magnesium alloy (processed at an extrusion temperature of 320&#xa0;°C and an extrusion ratio of 19) as the test material to carry out early-stage LCF experiments under different strain amplitudes (± 0.4%, ± 0.6%, and ± 0.8%) and loading frequencies (0.1&#xa0;Hz, 0.3&#xa0;Hz, and 0.5&#xa0;Hz). The experiments revealed that at a constant loading frequency, as strain amplitude increases, twins gradually emerge, tension–compression asymmetry appears in the hysteresis loops, the maximum values of kernel average misorientation (KAM) and texture intensity both exhibit a trend of first increasing then decreasing, and the deformation mode transitions from being dislocation slip-dominated to co-dominated by twinning and slip; when strain amplitude is fixed, the number of twins increases and tension–compression asymmetry strengthens with the rise of loading frequency, while with increasing strain amplitude, the material is dominated by cyclic hardening accompanied by cyclic softening, which is mainly due to the shift of the material’s deformation mechanism from basal slip dominance to twinning dominance.</p>

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Effects of strain amplitude and loading frequency on the low-cycle fatigue behavior of as-extruded ZK60 magnesium alloy

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Xiaoran Hu,
  • Rongrong Ji,
  • Bin Liu,
  • Yong Xue

摘要

Magnesium alloys, the lightest engineering materials, are widely applied in aerospace, military armaments, rail transportation, and 3C products; however, their hexagonal close-packed (HCP) crystal structure renders them highly sensitive to fatigue loading, making the investigation of their fatigue characteristics imperative. In recent years, scholars at home and abroad have achieved notable progress in fatigue research on magnesium alloys, and since strain amplitude and loading frequency are two key factors influencing low-cycle fatigue (LCF) behavior, this study employed as-extruded ZK60 magnesium alloy (processed at an extrusion temperature of 320 °C and an extrusion ratio of 19) as the test material to carry out early-stage LCF experiments under different strain amplitudes (± 0.4%, ± 0.6%, and ± 0.8%) and loading frequencies (0.1 Hz, 0.3 Hz, and 0.5 Hz). The experiments revealed that at a constant loading frequency, as strain amplitude increases, twins gradually emerge, tension–compression asymmetry appears in the hysteresis loops, the maximum values of kernel average misorientation (KAM) and texture intensity both exhibit a trend of first increasing then decreasing, and the deformation mode transitions from being dislocation slip-dominated to co-dominated by twinning and slip; when strain amplitude is fixed, the number of twins increases and tension–compression asymmetry strengthens with the rise of loading frequency, while with increasing strain amplitude, the material is dominated by cyclic hardening accompanied by cyclic softening, which is mainly due to the shift of the material’s deformation mechanism from basal slip dominance to twinning dominance.