Portevin-Le chatelier effect

Franklin, Mertens, Marder
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引用次数: 55

Abstract

Aluminum subjected to smooth mechanical loading does not often deform in a correspondingly smooth manner. Typically it deforms inhomogeneously through the propagation of deformation fronts that slowly traverse the sample. These are called Portevin-Le Chatelier fronts; what determines their velocity has been somewhat mysterious. We present a phenomenological theory for deformation fronts that centers on a nonlocal rate dependence of the flow stress. In a one-dimensional idealization the equations can be solved exactly, and compared directly with experiment. Many significant features of deformation fronts are captured, including a well-known transition from hopping to continuous front motion. The phenomenology's predictions are confirmed by our experiments.

波蒂文-勒夏特列效应
经受光滑机械载荷的铝通常不会以相应的光滑方式变形。通常,它通过缓慢穿过样品的变形前沿的传播而不均匀变形。这些被称为波蒂文-勒夏特列锋面;是什么决定了它们的速度一直是个谜。我们提出了一种变形前沿的现象学理论,该理论以流动应力的非局部速率依赖为中心。在一维理想情况下,方程可以精确求解,并与实验直接比较。形变锋面的许多重要特征被捕获,包括众所周知的从跳跃到连续锋面运动的转变。我们的实验证实了现象学的预言。
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