金属玻璃上压痕缺口的强化效应及其对应力三轴性的敏感性

IF 3.2 3区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of Non-crystalline Solids Pub Date : 2024-08-31 DOI:10.1016/j.jnoncrysol.2024.123187
Rutong Wan , Zhilin Long , Yuxuan Cui , Lidong You
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引用次数: 0

摘要

本研究利用分子动力学模拟,通过压杆循环压缩策略成功构建了具有环形压痕缺口的金属玻璃样品,并对比分析了具有相同应力三轴性和缺口尺寸的切口缺口金属玻璃样品在三轴压缩下的力学行为。结果发现,压痕缺口能进一步提高金属玻璃的强度和塑性,而对相同缺口尺寸的切口缺口金属玻璃则不敏感。在三轴压缩过程中,再生和剪切软化会导致自由体积增大,而扩散和残余压应力则会导致自由体积减小。应力的三轴性在它们的竞争中起着关键的调节作用,并影响着自由体积变化的最终状态。这项研究为提高金属玻璃的强度和塑性提供了新的理论基础和工艺思路。
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Strengthening effects of indentation notches on metallic glasses and their sensitivity to stress triaxiality

In this study, a metallic glass sample with an annular indentation notch was successfully constructed by a compression rod cyclic compression strategy using molecular dynamics simulation, and the mechanical behaviors of cut-notched metallic glass samples with the same stress triaxiality and notch size under triaxial compression were comparatively analyzed. It is found that the indentation notch further improves the strength and plasticity of the metallic glass, while it is insensitive to the cut-notched metallic glass with the same notch size. During triaxial compression, rejuvenation and shear softening lead to an increase in free volume, while diffusion and residual compressive stresses lead to a decrease in free volume. The stress triaxiality plays a key regulatory role in their competition and affects the final state of free volume change. This study provides a new theoretical basis and process idea for the enhancement of strength and plasticity of metallic glass.

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来源期刊
Journal of Non-crystalline Solids
Journal of Non-crystalline Solids 工程技术-材料科学:硅酸盐
CiteScore
6.50
自引率
11.40%
发文量
576
审稿时长
35 days
期刊介绍: The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.
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