HfZrTiTaAl系高熵合金动态变形、损伤及破坏行为

doi:10.12382/bgxb.2023.1183

摘要/Abstract

摘要：

高熵合金因其优异的综合力学性能被应用于高速碰撞和爆炸冲击等极端环境。为研究高熵合金在动态加载下变形、损伤及破坏行为,设计并制备了HfZrTiTaAl系难熔高熵合金,开展准静态压缩实验和分离式霍普金森压杆实验,结合数值模拟得到含损伤的Johnson-Cook本构模型参数,模拟材料在动态加载下的损伤演化过程及破坏。研究结果表明:该难熔高熵合金在准静态压缩条件下具有良好的塑性,在0.001~3500s^-1应变率范围内,HfZrTiTaAl系高熵合金具有应变率效应,屈服强度从1140MPa增加到1568MPa;在高应变率加载下试样的损伤主要集中在与加载方向呈45°的断面上,且在试样中间的单元损伤程度大于试样两侧单元的损伤程度;随着加载应变率的增大,损伤度大于0.8的单元占试样总单元的百分比也逐渐增大。

关键词: 高熵合金, 动态力学性能, Johnson-Cook本构模型, 损伤演化, 有限元模拟

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

中图分类号:

O347.3

高茂国, 刘睿, 郭岩松, 耿恒恒, 陈鹏万. HfZrTiTaAl系高熵合金动态变形、损伤及破坏行为[J]. 兵工学报, 2025, 46(1): 231183-.

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-.

图/表 15

图1 SHPB实验装置

Fig.1 Setup of SHPB

图2 HfZrTiTaAl系高熵合金的微观组织

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

图3 HfZrTiTaAl系高熵合金的TEM图像

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

图4 不同应变率下HfZrTiTaAl系高熵合金力学性能

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

图5 本文HfZrTiTaAl高熵合金与其他难熔高熵合金力学性能对比[15,18,20,25⇓⇓⇓⇓⇓⇓⇓⇓-33]

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]

图6 试样在不同应变率的断口形貌

Fig.6 Fracture morphologies of samples under different strain rates

图7 SHPB的有限元模型

Fig.7 Finite element model of SHPB

表1 高熵合金的J-C模型参数

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

表2 高熵合金的J-C本构模型的失效参数

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

图8 应变率为2000s-1和2500s-1下实验与仿真的真实应力-时间和真实应力-应变对比

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

图9 应变率为3000s-1和3500s-1实验与仿真的真实应力-时间和真实应力-应变对比

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

图10 不同加载应变率下试样形态的实验(上)与仿真(下)对比图

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

图11 试样在不同方向上的损伤云图

Fig.11 Damage cloud maps of specimen on different planes

图12 试样在不同截面的损伤云图和对应的单元损伤曲线

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

图13 不同加载应变率下损伤度大于0.8的单元占试样总单元的百分比

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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