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Analysing hysteresis and residual strains in thermal cycling curves of short fibre reinforced Mg-MMCs

机译：分析短纤维增强Mg-MMC的热循环曲线中的磁滞和残余应变

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摘要

Hysteresis and residual strains as exhibited by thermal cycling curves of QE22 based Mg alloy reinforced with Maftech~(~R), Saffil~(~R) or Supertech~(~R) short fibres are analysed in order to interpret them correctly. It is found that parts of these arise from the instrument and therefore they do not have much meaning as such. The real permanent dimensional change in the material is imparted by plastic deformation of the matrix above 250-260℃ in the longitudinal direction and by release of residual compressive strain arising from the squeeze casting process above 195-205℃ in the transverse direction. This irreversible strain is measured by the deviation from the linear portion of the strain vs. temperature curves at higher temperatures. No microstructural change is observed on thermal cycling of metal matrix composites.
机译：分析了用Maftech〜（〜R），Saffil〜（〜R）或Supertech〜（〜R）短纤维增强的QE22基镁合金的热循环曲线所显示的磁滞和残余应变，以便正确地解释它们。发现其中的一部分来自仪器，因此它们本身没有太多意义。材料的真正永久尺寸变化是由于基体在纵向250-260℃以上的塑性变形以及在横向195-205℃以上的挤压铸造过程中释放的残余压缩应变的释放而引起的。通过在较高温度下相对于温度曲线的线性部分的偏差来测量该不可逆应变。在金属基复合材料的热循环中未观察到微观结构变化。

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