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<p>Low-cycle fatigue behavior of a T6-treated Mg–9Al–1Sn–T6 alloy was investigated at both room temperature and an elevated temperature (ET) of 423 K (150&#xa0;°C). The alloy exhibited continuous work hardening at room temperature, while it showed cyclic saturation at 150&#xa0;°C. When the strain amplitude reached 0.6 pct, the stress amplitude of the Mg–9Al–1Sn–T6 alloy at 150&#xa0;°C initially increased slightly, followed by a gradual decrease. Fatigue deformation of the alloy is predominantly governed by dislocation slip. The presence of both curved and linear dislocations in the microstructure at 150&#xa0;°C indicates that high temperature activates nonbasal slip systems. Precipitates and residual phases impede dislocation movement, leading to an increase in stress amplitude. Fatigue cracks primarily originate from casting defects and surface grains, regardless of testing temperature. At 150&#xa0;°C, oxides formed during crack propagation, acting as new initiation sites and promoting crack growth, thereby decreasing the fatigue life.</p>

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Low-Cycle Fatigue Behavior of a Mg–9Al–1Sn–T6 Alloy at Both Room Temperature and 150 °C

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Zhenming Li,
  • Qigui Wang,
  • Peng Zhang,
  • Jiayin Wang,
  • Chen Zheng,
  • Kewen Fu

摘要

Low-cycle fatigue behavior of a T6-treated Mg–9Al–1Sn–T6 alloy was investigated at both room temperature and an elevated temperature (ET) of 423 K (150 °C). The alloy exhibited continuous work hardening at room temperature, while it showed cyclic saturation at 150 °C. When the strain amplitude reached 0.6 pct, the stress amplitude of the Mg–9Al–1Sn–T6 alloy at 150 °C initially increased slightly, followed by a gradual decrease. Fatigue deformation of the alloy is predominantly governed by dislocation slip. The presence of both curved and linear dislocations in the microstructure at 150 °C indicates that high temperature activates nonbasal slip systems. Precipitates and residual phases impede dislocation movement, leading to an increase in stress amplitude. Fatigue cracks primarily originate from casting defects and surface grains, regardless of testing temperature. At 150 °C, oxides formed during crack propagation, acting as new initiation sites and promoting crack growth, thereby decreasing the fatigue life.