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首页> 外文期刊>Materials Science and Engineering >Low cycle fatigue behavior of magnesium matrix nanocomposite at ambient and elevated temperatures
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Low cycle fatigue behavior of magnesium matrix nanocomposite at ambient and elevated temperatures

机译：镁基质纳米复合材料在环境下的低循环疲劳行为，温度升高

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AZ31B alloy reinforced by 1.5 vol.% nano-sized Al_2O_3 particles has been subjected to fully-reversed strain-controlled uniaxial tension-compression cyclic loading at room temperature, 100°C, and 200°C. A combination of mechanical and magnetic stir casting methods followed by a hot-extrusion process was used to fabricate the composite material. Cyclic and fatigue behaviors of the composite were studied at the strain ranges of 0.8%-2.5%. The experimental results of the fatigue lives were used to assess and compare the life prediction capabilities of different existing strain-based and energy-based fatigue models. The results exhibited that the presence of the nano-sized reinforcing particles leads to a homogenously fine microstructure and slightly changes the texture of the composite extrusion, compared to the typical microstructure and texture of monolithic AZ31B extrusion. The cyclic behavior of the composite is altered from an asymmetric shape at room temperature to a symmetric one at 200°C, resulting in reduction of mean stress. Unlike the room-temperature behavior, twinning and detwinning are not governing plastic deformation mechanisms at the elevated temperatures, especially at 200°C. Cyclic softening occurs by increasing the temperature, in a manner similar to the monotonic tensile tests. Due to the strain-controlled loading and increasing the composite ductility at the elevated temperatures, the fatigue lives are comparable at the different temperatures. Finally, considering the results at all the temperatures, Jahed-Varvani (JV) as an energy-based model shows a more promising life prediction.
机译：AZ31B合金加强1.5体积。％纳米尺寸的Al_2O_3颗粒在室温下进行完全反向的应变控制的单轴张力 - 压缩环状负载，100℃和200℃。采用机械和磁力搅拌方法的组合，然后用热挤出工艺制造复合材料。在0.8％-2.5％的应变范围内研究复合材料的环状和疲劳行为。疲劳生活的实验结果用于评估和比较不同现有的基于菌株和基于能量的疲劳模型的寿命预测能力。结果表明，纳米尺寸的增强颗粒的存在导致均匀的微观结构，与单片AZ31B挤出的典型微观结构和质地相比，复合材料挤出的质地略微改变。复合材料的循环行为在室温下从不对称形状改变为在200℃的对称上，导致平均应力的降低。与房间温度行为不同，孪生和碎屑不是在升高的温度下控制塑性变形机制，特别是在200℃下。通过增加温度，以类似于单调拉伸试验的方式发生循环软化。由于应变控制的载荷和增加了高温下的复合延展性，疲劳寿命在不同的温度下可比较。最后，考虑到所有温度的结果，Jahed-Varvani（JV）作为基于能量的模型显示了更有前途的寿命预测。

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