开孔纳米非晶合金力学性能的尺寸效应及其原子起源

IF 3.2 3区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
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引用次数: 0

摘要

纳米多孔非晶合金具有出色的机械性能,包括增强的延展性、高强度密度比和优异的韧性。本文构建了具有自相似微结构但韧带尺寸不同的纳米多孔铜锌非晶合金(NP-CuZr AAs)的原子模型。利用分子动力学模拟研究了韧带尺寸对其力学性能的影响。结果发现,拉伸时的屈服强度、屈服应变和杨氏模量均高于压缩时的屈服强度、屈服应变和杨氏模量。这种拉伸与压缩的不对称源于表面效应,随着韧带尺寸的减小,这种不对称变得更加明显。随着韧带尺寸的增大,杨氏模量和压缩屈服强度增加,而拉伸屈服强度和极限拉伸强度降低。拉伸行为包括线性弹性变形、应变硬化和韧带衰减阶段。在韧带衰减变形阶段,韧带尺寸越大,韧带缩颈和断裂越严重,导致抗应力相对较低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Size effect and its atomistic origin on the mechanical properties of open-cell nanoporous amorphous alloy
Nanoporous amorphous alloys exhibit outstanding mechanical properties, including enhanced ductility, high strength-to-density ratio, and exceptional toughness. In this paper, atomistic models of nanoporous CuZr amorphous alloys (NP–CuZr AAs) with self-similar microstructures but varying ligament sizes are constructed. Molecular dynamics simulations are employed to examine the effects of ligament size on their mechanical properties. The yield strength, yield strain, and Young's modulus are found to be higher under tension than under compression. This tension-compression asymmetry stems from the surface effect, and it becomes more pronounced with decreasing ligament size. As the ligament size increases, the Young's modulus and compressive yield strength increase, while the tensile yield strength and ultimate tensile strength decrease. The tensile behavior comprises linear elastic deformation, strain-hardening, and ligament decay stages. During the ligament decay deformation stage, ligament necking and fracture are more severe with larger ligament sizes, resulting in relatively lower resistance stress.
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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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