Micro-plasticity and recent insights from intermittent and small-scale plasticity
Micro-plasticity and recent insights from intermittent and small-scale plasticity
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DOI：
10.1016/j.actamat.2017.06.023
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发表时间：
2018-01-15
期刊：
影响因子：
9.4
通讯作者：
Derlet, P. M.
中科院分区：
文献类型：
--
作者：
Maass, R.;Derlet, P. M.
在宏观屈服之前，大多数材料经历在常规的体变形实验中不能解决的塑性活动的制度。在该预屈服或微塑性状态下，探测的是初始三维缺陷网络，并且间歇性演变的微观结构允许塑性应变的小增量。通过减少样本量，这种间歇性活动变得越来越明显，并且可以通过小规模机械测试进行常规观察。在某些情况下，间歇性活动表现出无标度行为的方面，促使范式转移远离传统的微观结构依赖的单元机制，可能与一个明确定义的长度和应力规模。在这篇文章中，我们讨论和审查经典的微观塑性和间歇性流动之间的连接，在所有的长度尺度，目的是突出的小型化测试的价值，作为一种手段来解开这个非常早期的制度，散装塑性。(C)2017 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Prior to macroscopic yielding, most materials undergo a regime of plastic activity that cannot be resolved in conventional bulk deformation experiments. In this pre-yield, or micro-plastic regime, it is the initial three dimensional defect network that is probed and the intermittently evolving microstructure admits small increments in plastic strain. By reducing the sample size, this intermittent activity becomes increasingly apparent and can be routinely observed through small-scale mechanical testing. In some cases, the intermittent activity was shown to exhibit aspects of scale-free behavior, prompting a paradigm shift away from traditional microstructure-dependent unit mechanisms that may be associated with a well-defined length and stress scale. In this article, we discuss and review connections between classical micro-plasticity and intermittent flow across all length scales, with the aim of highlighting the value of miniaturized testing as a means to unravel this very early regime of bulk plasticity. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.