铸态Al0.3CoCrFeNi高熵合金力学行为、本构建模及断裂准则研究

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2023-11-01 DOI:10.1016/j.intermet.2023.108029

Zerui Sun , Changgen Shi , Xinke Xiao , Xuchuan Luo , Zhiqun Xia , Qin Yin

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引用次数: 1

摘要

近年来，高熵合金(HEAs)在合金设计和热加工方面得到了广泛的关注。本研究的目的是研究具有代表性的HEA Al0.3CoCrFeNi在不同应力状态、温度和应变速率下的力学响应，建立其本构方程和断裂准则。采用混合FEM/EX方法，采用改进的Johnson-Cook (MJC)模型对合金的本构行为进行了表征，并使用霍斯福德-库仑(HC)方程对合金的断裂性能进行了评估。实验结果表明，铸态Al0.3CoCrFeNi在室温下具有显著的抗拉强度(578.1 MPa)和塑性(69%)。然而，在400°C至650°C的高温下，观察到延展性降低，并伴有锯齿化行为。值得注意的是，在800°C时检测到沉淀硬化，表明通过沉淀形成强化。此外，Al0.3CoCrFeNi表现出显著的应变率敏感性和正应变率效应，强调了其在不同加载条件下的动态响应。通过Taylor冲击试验的变形和断裂模式验证了本构模型和断裂准则的准确性。MJC模型的预测结果与实验数据的偏差在10%以内，而HC断裂准则(考虑应力三轴性和Lode参数)可以有效地预测弹丸的剪切断裂。弹丸裂纹的形成是拉伸和剪切共同作用的结果，然后在压缩和剪切共同作用下以45°角扩展。这项全面的研究提高了对Al0.3CoCrFeNi的力学性能的理解，为其在工程上的应用，特别是在冲击防护方面的应用提供了有价值的见解。

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Investigation of mechanical behavior, constitutive modeling, and fracture criteria for as-cast Al0.3CoCrFeNi high entropy alloy

High entropy alloys (HEAs) have garnered significant attention in recent years, primarily focusing on alloying design and thermal processing. The objective of this study was to investigate the mechanical response of Al_0.3CoCrFeNi, a representative HEA, under various stress states, temperatures, and strain rates, aiming to establish its constitutive equation and fracture criteria. Employing a hybrid FEM/EX approach, the constitutive behaviour of the alloy was characterized using the modified Johnson-Cook (MJC) model, while the fracture properties were assessed using the Hosford-Coulomb (HC) equation. Experimental findings highlighted the remarkable tensile strength (578.1 MPa) and ductility (69%) of the as-cast Al_0.3CoCrFeNi at room temperature. However, at elevated temperatures ranging from 400 °C to 650 °C, a reduction in ductility was observed, accompanied by serration behaviour. Notably, precipitation hardening was detected at 800 °C, indicative of strengthening through precipitate formation. Additionally, Al_0.3CoCrFeNi exhibited significant strain rate sensitivity and a positive strain rate effect, emphasizing its dynamic response under different loading conditions. The accuracy of the constitutive model and fracture criteria was validated through the examination of deformation and fracture modes in Taylor impact tests. The MJC model demonstrated predictions within a 10% deviation from experimental data, while the HC fracture criterion, accounting for stress triaxiality and Lode parameters, effectively predicted shear fracture in the projectiles. Crack formation in the projectiles resulted from a combination of tension and shear, followed by propagation at a 45° angle under combined compression and shear loading. This comprehensive study enhances understanding of the mechanical properties of Al_0.3CoCrFeNi, providing valuable insights for its application in engineering, particularly in impact protection.

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.