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首页> 外文期刊>Materials Science and Engineering >High temperature deformation of a Cu_(40)Zr_(44)Ag_8Al_8 bulk metallic glass
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High temperature deformation of a Cu_(40)Zr_(44)Ag_8Al_8 bulk metallic glass

机译：Cu_（40）Zr_（44）Ag_8Al_8大块金属玻璃的高温变形

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The deformation behavior of a Cu_(40)Zr_(44)Ag_8Al_8 bulk metallic glass in its supercooled liquid region was investigated in compression. Strain rate jumps were carried out at various temperatures ranging from about T_g toT_g + 20 K. The results show that the alloy exhibits quasi-Newtonian behavior at the highest temperature with a transition to non Newtonian flow when temperature decreases and strain rate increases. The mechanical behavior has been analyzed in the framework of the free volume model. The material has been characterized after deformation at T_g + 20 K by XRD and comparison has been made with the same material simply held at high temperature for the same duration. It was observed that deformation slightly accelerates crystallization which results in a very important hardening on the stress-strain curve. However, even if there is no hardening at high temperature which suggests that no crystallization has occurred, some hardening is observed at room temperature even for short holding times at high temperature.
机译：研究了Cu_（40）Zr_（44）Ag_8Al_8大块金属玻璃在其过冷液体区域的压缩变形行为。在大约T_g到T_g + 20 K的不同温度下进行应变速率跳跃。结果表明，合金在最高温度下表现出准牛顿行为，当温度降低和应变速率增加时，过渡到非牛顿流。在自由体积模型的框架内分析了机械性能。通过XRD在T_g + 20 K下变形后对该材料进行了表征，并使用简单地在高温下保持相同时间的相同材料进行了比较。观察到变形稍微加速了结晶，这导致应力-应变曲线上非常重要的硬化。然而，即使在高温下没有硬化表明没有发生结晶，即使在高温下短的保持时间在室温下也观察到一些硬化。

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