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首页> 外文期刊>Philosophical Magazine Letters >Dislocation-induced anomalous softening of solid helium
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Dislocation-induced anomalous softening of solid helium

机译:位错引起的固态氦异常软化

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The classical motion of gliding dislocation lines in slip planes of crystalline solid helium leads to plastic deformation even at temperatures far below the Debye temperature and can affect elastic properties. In this work we propose that the gliding of dislocations and plasticity may be the origin of many observed elastic anomalies in solid 4~He, which have been argued to be connected to supersolidity. We present a dislocation motion model that describes the stress-strain x-e curves and work-hardening rate dτ/dε of a shear experiment performed at constant strain rate ε in solid helium. The calculated dτ/dε exhibits strong softening with increasing temperature owing to the motion of dislocations, which mimics anomalous softening of the elastic shear modulus μ. In the same temperature region the motion of dislocations causes dissipation with a prominent peak.
机译:即使在远低于德拜温度的温度下,滑动位错线在结晶固体氦气滑移面上的经典运动也会导致塑性变形,并且会影响弹性。在这项工作中,我们提出位错的滑动和可塑性可能是固体4〜He中许多观察到的弹性异常的起源,这些异常被认为与超固体有关。我们提出了一种位错运动模型,描述了在恒定氦气中以恒定应变率ε进行的剪切实验的应力应变x-e曲线和加工硬化率dτ/dε。由于位错的运动,计算出的dτ/dε随着温度的升高呈现出强烈的软化,这类似于弹性剪切模量μ的异常软化。在相同温度区域中,位错的运动会导致耗散,并具有明显的峰值。

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