High strain-rate effect on microstructure evolution and plasticity of aluminum 5052 alloy nano-multilayer: A molecular dynamics study

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2022-07-01 DOI:10.1016/j.vacuum.2022.111104

Dang Thi Hong Hue, Van-Khanh Tran, Van-Lam Nguyen, Le Van Lich, Van-Hai Dinh, Trong-Giang Nguyen

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引用次数: 9

Abstract

Effects of strain rates on mechanical behaviors of nano-multilayered aluminum 5052 alloys are explored via molecular dynamics simulations. Yield strength and ultimate tensile strength increase with an increase in strain rates. The increase of the yield stress with the strain rate is caused by the delay in the onset of dislocation propagation. In addition, the strain rate sensitivity and the yield stress activation volume significantly depend on strain rate. Under tensile loading, the pristine face-centered cubic structure of the alloy successively transforms to a hexagonal close-packed structure through the intermediate body-centered cubic structure during plastic deformation processes, regardless of strain rates. Dislocation density and volume fraction of phase significantly depend on strain rate. In addition, discussions on the formation, movement, and interaction of dislocations under low and high strain rates are presented.

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高应变速率对5052铝合金纳米多层结构演变和塑性的影响：分子动力学研究

通过分子动力学模拟研究了应变速率对纳米多层铝5052合金力学行为的影响。屈服强度和极限抗拉强度随应变率的增加而增加。屈服应力随应变速率的增加是由于位错扩展开始的延迟引起的。应变速率敏感性和屈服应力激活体积与应变速率有显著关系。在拉伸载荷作用下，在塑性变形过程中，无论应变速率如何，合金的原始面心立方结构都通过中间体心立方结构依次转变为六边形密排结构。位错密度和相的体积分数与应变速率有显著关系。此外，还讨论了在低应变率和高应变率下位错的形成、运动和相互作用。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.