Effect of void size and position on mechanical properties of nanotwinned metals under cyclic loading

IF 2.1 4区材料科学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of Nanoparticle Research Pub Date : 2024-08-14 DOI:10.1007/s11051-024-06100-5

Zailin Yang, Xiaoyang Ding, Jin Liu, Yong Yang

引用次数: 0

Abstract

In this work, molecular dynamic simulations (MDs) have been performed to study the deformation behavior of nanotwinned (NT) copper samples containing voids under cyclic loading. Results show that there are two stable states in the cyclic deformation process, and there is no obvious dislocation accumulation during the first stable state. When the void is in the twin lamella, it plays a softening role by emitting dislocations to promote the migration of twin boundaries (TBs), and the increase in the void size reduces the duration of the first stable state. When the void is through the TB, the TB limits the dislocation emission from the void, and the duration of the first stable state is not significantly affected by the void size. This study contributes to the understanding of the effect of defects on mechanical response of NT metals under cyclic loading.

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空隙大小和位置对循环加载下纳米绕丝金属机械性能的影响

本研究对含有空隙的纳米孪晶（NT）铜样品在循环加载下的变形行为进行了分子动力学模拟（MDs）研究。结果表明，循环变形过程存在两种稳定状态，在第一种稳定状态下没有明显的位错堆积。当空隙位于孪晶薄片中时，它通过释放位错促进孪晶边界（TB）的迁移而起到软化作用，空隙尺寸的增大会缩短第一稳定状态的持续时间。当空隙穿过孪晶边界（TB）时，孪晶边界限制了空隙的位错发射，第一稳定状态的持续时间不受空隙大小的显著影响。这项研究有助于理解缺陷对循环加载下新界金属机械响应的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nanoparticle Research 工程技术-材料科学：综合

CiteScore

4.40

自引率

4.00%

发文量

198

审稿时长

3.9 months

期刊介绍： The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size. Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology. The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.