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<p>This study systematically investigates the crack initiation mechanisms and fatigue performance of AZ31B magnesium alloy at elevated temperatures (150&#xa0;°C) under different loading orientations, including the normal direction (ND), the bisector between the normal and rolling directions (ND-RD), and the rolling direction (RD). Experimental results show that, compared with room temperature, elevated temperature activates multiple slip systems and weakens grain boundary strength, reducing the barriers to crack initiation. RD specimens retain the highest fatigue resistance, whereas ND-RD specimens exhibit the lowest. During the crack initiation stage, ND specimens primarily exhibit basal and prismatic slip, whereas RD specimens are characterized by basal and pyramidal slip. Significant grain orientation dispersion in ND-RD specimens promotes intergranular crack initiation, which occurs more readily than transgranular cracking and accelerates damage accumulation. Moreover, elevated temperature facilitates the formation of a brittle MgO surface layer, further promoting crack initiation and contributing to fatigue degradation.</p>

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Texture-dependent crack initiation in rolled AZ31B magnesium alloy under very high cycle fatigue at elevated temperature

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Min Zhan,
  • Shoucheng Shi,
  • Zhongmin Xiao,
  • Xue Li,
  • Hai Xiong,
  • Dianyang Zhu,
  • Lang Li,
  • Yao Chen,
  • Yongjie Liu,
  • Qingyuan Wang,
  • Chao He

摘要

This study systematically investigates the crack initiation mechanisms and fatigue performance of AZ31B magnesium alloy at elevated temperatures (150 °C) under different loading orientations, including the normal direction (ND), the bisector between the normal and rolling directions (ND-RD), and the rolling direction (RD). Experimental results show that, compared with room temperature, elevated temperature activates multiple slip systems and weakens grain boundary strength, reducing the barriers to crack initiation. RD specimens retain the highest fatigue resistance, whereas ND-RD specimens exhibit the lowest. During the crack initiation stage, ND specimens primarily exhibit basal and prismatic slip, whereas RD specimens are characterized by basal and pyramidal slip. Significant grain orientation dispersion in ND-RD specimens promotes intergranular crack initiation, which occurs more readily than transgranular cracking and accelerates damage accumulation. Moreover, elevated temperature facilitates the formation of a brittle MgO surface layer, further promoting crack initiation and contributing to fatigue degradation.