利用 COMSOL 多物理场优化激光沉积高熵合金的最大应变

IF 2.5 Q2 MULTIDISCIPLINARY SCIENCES Beni-Suef University Journal of Basic and Applied Sciences Pub Date : 2024-09-05 DOI:10.1186/s43088-024-00542-5
Dada Modupeola, Popoola Patricia
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引用次数: 0

摘要

背景激光金属沉积(LMD)是一种广泛使用的增材制造技术,用于生产具有特殊性能的复杂高熵合金,可用于多种应用领域。AlCoCrFeNiCu 高熵合金的成分设计有六种元素,其构型熵为 1.79 R,原子浓度介于 5% 与 35% 之间,因此根据玻尔兹曼理论,高熵合金体系在热力学上是有利的,这归因于核心效应。然而,高熵合金具有主要的体心立方结构,这种结构可能太脆,无法进行拉伸实验。在层沉积之前和过程中预热基底可能是一个潜在的解决方案,目前正在开发中,因为拉伸加载需要通过分析材料的屈服强度和极限拉伸强度来了解材料在拉伸下的行为。使用计算机辅助设计(CAD)实体模型,利用激光金属沉积(LMD)技术生成具有中等复杂几何特征的近净狗骨形合金。本研究使用 COMSOL Multiphysics 5.4 软件,针对激光沉积的高熵合金(脆性过大,无法进行拉伸测试)研究了一种简单有效的计算模型,用于模拟材料特性。使用 COMSOL Multiphysics 软件对 AlCoCrFeNiCu 高熵合金 "狗骨 "测试样品进行了拉伸加载建模。使用三维结构力学模型测量了轴向加载条件下的第一主应力和纵向应变。结果结果表明,由于合金的高熵效应和主导相结构,其极限抗拉强度为 8.47 N/m2。该模型通过分析残余应力和预测拉伸强度优化了 LMD 工艺,从而提供了显示高熵合金在航空航天应用中结构完整性潜力的见解。
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Optimizing the maximum strain of a laser-deposited high-entropy alloy using COMSOL multiphysics

Background

Laser metal deposition (LMD) is a widely used additive manufacturing technique for producing complex high entropy alloys with special properties for several applications. The AlCoCrFeNiCu HEAs compositional design has six elements with a configurational entropy of 1.79 R and atomic concentrations between 5 and 35%, so the HEA system is thermodynamically favorable according to Boltzmann’s theory, attributed to the core effects. However, the high-entropy alloy has dominant Body-Centered Cubic structures which may be too brittle to be examined in tension experimentally. Preheating the substrate before and during layer deposition could be a potential solution that is currently under development since tensile loading necessitates an understanding of a material's behavior under tension through an analysis of its yield and ultimate tensile strength. A computer-aided design (CAD) solid model was used to generate the near-net dog-bone form of the alloy with moderately complicated geometrical characteristics using laser metal deposition (LMD) technology. This study investigates a straightforward and effective computational model for simulating material properties, using COMSOL Multiphysics 5.4 software for laser-deposited high entropy alloys that are excessively brittle to be tested in tension. The AlCoCrFeNiCu high-entropy alloy "dog bone" test sample was modeled using COMSOL Multiphysics for tensile loading. The first principal stresses and longitudinal strain under axial loading conditions were measured using a three-dimensional (3D) structural mechanics’ model.

Results

The results showed the ultimate tensile strength is 8.47 N/m2, attributed to the high entropy effect and the dominant phase structure of the alloy.

Conclusion

Numerical models in this paper demonstrate the effect of stresses on the tensile behavior of the AlCoCrFeNiCu high-entropy alloy. The model optimizes the LMD process by analyzing residual stresses and predicting tensile strength, thus, providing insights that show the potential of high entropy alloys for structural integrity in aerospace applications.

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期刊介绍: Beni-Suef University Journal of Basic and Applied Sciences (BJBAS) is a peer-reviewed, open-access journal. This journal welcomes submissions of original research, literature reviews, and editorials in its respected fields of fundamental science, applied science (with a particular focus on the fields of applied nanotechnology and biotechnology), medical sciences, pharmaceutical sciences, and engineering. The multidisciplinary aspects of the journal encourage global collaboration between researchers in multiple fields and provide cross-disciplinary dissemination of findings.
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