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arXiv 1607.07592cond-mat.stat-mechcond-mat.mtrl-sci
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晶体塑性的玻璃态特征

Glassy features of crystal plasticity

Arttu Lehtinen, Giulio Costantini, Mikko J. Alava, Stefano Zapperi, Lasse Laurson

摘要:

晶体的塑性是由于位错的雪崩式运动而产生的形变爆发。在这里,我们进行了广泛的数值模拟的三维位错动力学模型下准静态应力控制加载。我们的研究结果表明,雪崩是幂律分布,并显示特殊的应力和样本大小的依赖性:平均雪崩大小与所施加的应力呈指数增长,和滑移量与系统的大小增加。这些结果表明,在结晶材料的间歇变形过程中表现出类似于玻璃体系的扩展的临界相,而不是源自非平衡相变临界点。

英文摘要:

Crystal plasticity occurs by deformation bursts due to the avalanche-like motion of dislocations. Here we perform extensive numerical simulations of a three-dimensional dislocation dynamics model under quasistatic stress-controlled loading. Our results show that avalanches are power-law distributed, and display peculiar stress and sample size dependence: The average avalanche size grows exponentially with the applied stress, and the amount of slip increases with the system size. These results suggest that intermittent deformation processes in crystalline materials exhibit an extended critical-like phase in analogy to glassy systems, instead of originating from a non-equilibrium phase transition critical point.

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