Dynamic Deformation,Damage and Failure Behaviors of High-entropy HfZrTiTaAl Alloy

doi:10.12382/bgxb.2023.1183

Abstract

Abstract:

High-entropy alloys are applied in extreme environments,such as high-speed collision and explosive impact,due to their excellent comprehensive mechanical properties.To study the deformation,damage,and failure behaviors of high-entropy alloys under dynamic loading,HfZrTiTaAl-based refractory high-entropy alloys are designed and prepared.Quasi static compression experiment and split Hopkinson bar (SHPB) experiment are conducted on the high-entropy alloys,and the Johnson-Cook constitutive model parameters containing damage are obtained through numerical simulation.The damage evolution process and failure of material under dynamic loading are simulated.The results indicate that the refractory high-entropy alloy exhibits good plasticity under quasi-static compression conditions.Within the strain rate range of 0.001s^-1-3500s^-1,the HfZrTiTaAl-based high-entropy alloy exhibits a strain rate effect,with a yield strength increasing from 1140MPa to 1568MPa.Numerical simulation shows that the damage of specimen is mainly concentrated on the cross-section at 45° angle to the loading direction under high strain rate loading,and the damage degree of the elements in the middle of the specimen is greater than that of the elements on both sides of the specimen.As the loading strain rate increases,the percentage of elements with a damage degree greater than 0.8 in the total specimen elements gradually increases.

Key words: high-entropy alloy, dynamic mechanical property, Johnson-Cook constitutive model, damage evolution, finite element simulation

CLC Number:

O347.3

GAO Maoguo, LIU Rui, GUO Yansong, GENG Hengheng, CHEN Pengwan. Dynamic Deformation,Damage and Failure Behaviors of High-entropy HfZrTiTaAl Alloy[J]. Acta Armamentarii, 2025, 46(1): 231183-.

Figures/Tables 15

Fig.1 Setup of SHPB

Fig.2 Microstructure of HfZrTiTaAl-based high-entropy alloys

Fig.3 TEM images of HfZrTiTaAl-based high-entropy alloys

Fig.4 Mechanical properties of HfZrTiTaAl-based high-entropy alloys under different strain rates

Fig.5 Comparison of mechanical properties of HfZrTiTaAl—based high-entropy alloy and other refractory high-entropy alloys in this article[15,18,20,25⇓⇓⇓⇓⇓⇓⇓⇓-33]

Fig.6 Fracture morphologies of samples under different strain rates

Fig.7 Finite element model of SHPB

Table 1 J-C model parameters of high-entropy alloys

A/MPa	B/MPa	n	C	m
1200	160	0.231	0.029	1.0

Table 2 Failure parameters of J-C constitutive model of high-entropy alloys

D₁	D₂	D₃	D₄	D₅
-0.14	0.21	-0.5	0.0014	3.87

Fig.8 Comparison of experimental and simulated real stress-time curves and real stress-strain curves with strain rates of 2000s-1 and 2500s-1

Fig.9 Comparison of experimental and simulated real stress-time curves and real stress-strain curvess with strain rates of 3000s-1 and 3500s-1

Fig.10 Experimental (top) and simulation (bottom) comparison of specimen morphologies under different loading strain rates

Fig.11 Damage cloud maps of specimen on different planes

Fig.12 Damage cloud maps and corresponding unit damage curves ofspecimens at different cross-sections

Fig.13 The percentages of units with damage degree greater than 0.8 under different loading strain rates in the total specimen unit

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