Dynamic Impact Mechanics Response and Deformation Mechanisms of Al15(CoCrFeNi)85 High-entropy Alloy

doi:10.12382/bgxb.2025.0499

Abstract

Abstract:

The metastable face-centered cubic (FCC) and body-centered cubic (BCC) dual-phase Al₁₅(CoCrFeNi)₈₅ high-entropy alloy has significant application prospects in the field of impact-resistant structural materials. The paper aims to systematically examine its dynamic response and compressive deformation mechanisms. The quasi-static and dynamic compressive mechanical properties of the high-entropy alloy are characterized using a universal testing machine, split Hopkinson pressure bar (SHPB), electron backscatter diffraction (EBSD), and molecular dynamics (MD) simulations. The plastic stress-strain response, strain rate sensitivity, and microscopic deformation mechanisms of the high-entropy alloy are analyzed, and its strengthening mechanism under dynamic compression is elucidated. A dynamic constitutive model for the metastable dual-phase Al₁₅(CoCrFeNi)₈₅ is established. The high-entropy alloy exhibits strain rate sensitivity, of which the flow stress initially increase gradually and then rises sharply at larger strains. The base material is consisted of 71.4% FCC and 28.6% BCC phases. The FCC-to-BCC phase transformation under uniaxial compression is strain-rate-dependent. The ratio of FCC-to-BCC phase transformation under quasi-static loading is approximately 1∶1, whereas it is approximately 3∶7 under dynamic loading. MD simulations confirm the phase-transformation-dominated deformation mechanism. The plastic deformation shifts to full dislocation slip in BCC phases as their fraction increases. The dynamic stress-strain response is predicted using a modified Johnson-Cook constitutive model. These findings can provide theoretical guidance for the design and application of HEAs in impact-resistant structures.

Key words: High entropy alloy, dynamic mechanical property, J-C constitutive model, molecular dynamics simulation

CLC Number:

TH142.2

LING Jing, LIANG Yanxiang, JING Lin. Dynamic Impact Mechanics Response and Deformation Mechanisms of Al₁₅(CoCrFeNi)₈₅ High-entropy Alloy[J]. Acta Armamentarii, 2025, 46(10): 250499-.

Figures/Tables 14

Fig.1 Sampling and experimental methods of Al15(CoCrFeNi)85 high-entropy alloy

Fig.2 Schematic diagram of molecular dynamics simulation model for single-crystal Al15(CoCrFeNi)85 high-entropy alloy

Fig.3 Stress-strain responses of Al15(CoCrFeNi)85 hig-hentropy alloy at different strain rates

Fig.4 Phase and grain boundary diagrams of Al15(CoCrFeNi)85 high-entropy alloy at different strain rates

Fig.5 Orientation and local strain distribution of Al15(CoCrFeNi)85 high-entropy alloy at different strain rates

Fig.6 Microstructure evolution of Al15(CoCrFeNi)85 high-entropy alloy at different strain rates

Fig.7 LAM distribution of Al15(CoCrFeNi)85 high-entropy alloy at different strain rates

Fig.8 Atomic snapshots of microstructural evolution in Al15(CoCrFeNi)85 high-entropy alloy at different strain rates

Fig.9 Lattice atom ratio versus strain in Al15(CoCrFeNi)85 high-entropy alloy models at different strain rates

Fig.10 Dislocation evolution in different phases of Al15(CoCrFeNi)85 high-entropy alloy under compressive loading at 5×109s-1

Fig.11 Dislocation evolution in different phases of Al15(CoCrFeNi)85 high-entropy alloy under compressive loading at 2.5×1010s-1

Fig.12 Dislocation density-strain relationship of Al15(CoCrFeNi)85 high-entropy alloy at different strain rates

Fig.13 Relationship between thestrain rate sensitivity coefficient C and the dimensionless strain rate ${\stackrel{·}{\epsilon }}^{*}$

Fig.14 Comparison between model predicted and experimental compressive stress-strain responses of Al15(CoCrFeNi)85 high-entropy alloy at different train rates

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Dynamic Impact Mechanics Response and Deformation Mechanisms of Al₁₅(CoCrFeNi)₈₅ High-entropy Alloy

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