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研究了固溶处理、时效处理、固溶+时效处理对挤压变形AZ31镁合金低周疲劳性能的影响。结果表明,不同的热处理工艺可以提高挤压变形AZ31镁合金在较低外加总应变幅下的循环变形抗力;不同的热处理工艺可以提高挤压变形AZ31镁合金在较高外加总应变幅下的疲劳寿命,降低合金在较低外加总应变幅下的疲劳寿命;不同处理状态的挤压变形AZ31镁合金的塑性应变幅、弹性应变幅与疲劳断裂时的载荷反向周次之间的关系可分别用Coffin-Manson和Basquin公式来描述。此外,不同处理状态的挤压变形AZ31镁合金的循环应力幅与塑性应变幅之间呈线性关系。
The effects of solution treatment, aging treatment, solution treatment and aging treatment on the low cycle fatigue properties of extruded AZ31 magnesium alloy were studied. The results show that different heat treatment process can improve the cyclic deformation resistance of AZ31 magnesium alloy under a lower applied total strain amplitude. Different heat treatment process can improve the fatigue of AZ31 magnesium alloy under higher applied strain rate Life expectancy and reduce the fatigue life of the alloy at a lower applied total strain amplitude; the relationship between the plastic strain amplitude, the elastic strain amplitude and the load reverse cycle of the AZ31 magnesium alloy under different processing conditions can be respectively Described using the Coffin-Manson and Basquin formulas. In addition, the cyclic strain amplitude and plastic strain amplitude of extruded AZ31 magnesium alloy with different processing conditions showed a linear relationship.