Microstructural dependence of the incipient to homogeneous flow transition in metallic glass composites
Microstructural dependence of the incipient to homogeneous flow transition in metallic glass composites
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DOI：
10.1016/j.scriptamat.2020.06.066
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发表时间：
2020-11
影响因子：
6
通讯作者：
J. Gentile;D. Hofmann;J. Trelewicz
中科院分区：
文献类型：
--
作者：
J. Gentile;D. Hofmann;J. Trelewicz
作为非晶合金的延展性衍生物，金属玻璃复合材料既具有高强度，又具有减轻灾难性剪切局部化的能力，这一直困扰着单片金属玻璃。在这项研究中，我们采用结合应变场映射的键合界面压痕技术来确定金属玻璃复合材料的控制屈服准则，作为其微结构长度尺度的函数。从剪切面到最大剪切应力屈服标准的交叉在晶体分数约为60%时被发现，从而标志着从初始流到均匀流的有效转变，作为复合材料微观结构的主要变形模式。
As ductile derivatives of amorphous alloys, metallic glass composites balance high strength with the ability to mitigate catastrophic shear localization, which has long plagued monolithic metallic glasses. In this study, we employ a bonded-interface indentation technique coupled with strain field mapping to identify the governing yield criterion in metallic glass composites as a function of their microstructural length scales. A crossover from the shear plane to maximum shear stress yield criterion is uncovered at a crystalline fraction of approximately 60%, thus signaling an effective transition from incipient to homogeneous flow as the dominant deformation mode of the composite microstructure.