Non-repeatability of large plasticity for Fe-based bulk metallic glasses
Non-repeatability of large plasticity for Fe-based bulk metallic glasses
复制标题
铁基大块金属玻璃大塑性的不可重复性
DOI：
10.1016/j.jallcom.2016.03.169
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发表时间：
2016-08
影响因子：
6.2
通讯作者：
Shen Baolong
中科院分区：
文献类型：
--
作者：
Yang Weiming;Sun Baoan;Zhao Yucheng;Li Qiang;Hou Long;Luo Ning;Dun Chaochao;Zhao Chengliang;Ma Zhanguo;Liu Haishun;Shen Baolong
锯齿状流动是金属玻璃塑性变形的一个基本特征。在约束载荷条件下，剪切带的形成和扩展表现为应力-应变曲线的锯齿流。本文研究了不同塑性的Fe_（50）Ni_（30）P_（13）C_（7）非晶合金中的锯齿形流动。分布直方图显示在初始变形阶段（即，塑性变形在0-8%的范围内），而在随后的变形阶段（即，塑性变形8-14%）时，应力降频率分布既呈现单调递减分布，又呈现类似混沌动力学的峰形。结果表明，Fe 50 Ni 30 P13 C7非晶合金中剪切带的空间演化行为从自组织临界演化为锯齿流形式的混沌动力学，揭示了铁基大块非晶合金离散塑性的起源.该研究对于理解塑性变形机制具有潜在的应用价值。
Serrated flow is an essential characteristic of the plastic deformation of metallic glasses. Under restricted loading conditions, the formation and expansion of shear bands act as the serrated flow of stress-strain curves in metallic glasses. In this work, serrated flows in Fe50Ni30P13C7glassy samples with different plasticity were studied. The distribution histogram shows a monotonically decreasing trend during the initial deformation stage (i.e., the plastic deformation in the range of 0–8%), whereas in the following deformation stage (i.e., a plastic deformation of 8–14%), the stress drop frequency distribution presents both a monotonically decreasing distribution and a peak shape similar to chaotic dynamics. It is shown that the spatial evolution behavior of shear bands in Fe50Ni30P13C7metallic glasses evolved from self-organized critical to chaotic dynamics in the form of serrated flow, which reveals the origin of discrete plasticity of Fe-based bulk metallic glasses. This study has potential applications for understanding the plastic deformation mechanism.
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