CoCrNi系高熵合金析出强化的晶体塑性模型:力学性能及织构演化

doi:10.12382/bgxb.2025.0110

摘要/Abstract

摘要：

基于晶体塑性有限元框架,构建了可描述3级析出相结构CoCrNiSi_0.3C_0.048中熵合金在动态压缩下力学行为的建模方法。在3000s^-1应变率的加载条件下,研究了随机、高斯、旋转高斯、立方、铜型、黄铜等不同初始织构对应力-应变响应的影响。研究结果表明:随机织构和铜型织构在动态压缩下表现出较高的屈服强度和优异的塑性变形能力,而立方织构的综合性能相对较差。高应变速率下,析出相明显影响材料的强化作用;通过对屈服强度、塑性变形能力和硬化行为的综合分析,揭示了不同初始织构在高应变速率下对变形的影响,为含析出相高熵合金的优化设计和实际应用提供了科学依据。

关键词: 晶体塑性有限元模型, 高熵合金, 析出相, 织构, 动态压缩

Abstract:

Based on the Crystal Plasticity Finite Element (CPFEM) framework, a modeling method for describing the mechanical behavior of CoCrNiSi_0.3C_0.048 medium entropy alloy with three-stage precipitated phase structure under dynamic compression was constructed. Under the loading condition of 3000s^-1 strain rate, the effects of different initial textures such as random, Gaussian, rotating Gaussian, cubic, copper, and brass on the stress-strain response were studied. The results show that the random texture and copper texture exhibit higher yield strength and excellent plastic deformation ability under dynamic compression, while the comprehensive performance of the cube texture is relatively poor. At high strain rate, the precipitated phase significantly affects the strengthening effect of the material. Through the comprehensive analysis of yield strength, plastic deformation ability and hardening behavior, the influence of different initial textures on deformation at high strain rate is revealed, which provides a scientific basis for the optimization design and practical application of high entropy alloys containing precipitated phases.

Key words: crystal plastic finite element model, high entropy alloy, precipitation phase, texture, dynamic compression

中图分类号:

TJ05

张雯雯, 赵聃, 赵伟涛, 王强, 王建军, 马胜国, 张团卫, 王志华. CoCrNi系高熵合金析出强化的晶体塑性模型:力学性能及织构演化[J]. 兵工学报, 2025, 46(10): 250110-.

ZHANG Wenwen, ZHAO Dan, ZHAO Weitao, WANG Qiang, WANG Jianjun, MA Shengguo, ZHANG Tuanwei, WANG Zhihua. Crystal Plasticity Model of Precipitation Strengthening of CoCrNi-based High-entropy Alloys: Mechanical Properties and Texture Evolution[J]. Acta Armamentarii, 2025, 46(10): 250110-.

图/表 16

图1 SHPB示意图

Fig.1 Schematic diagram of SHPB

图2 CoCrNiSi0.3C0.048 中熵合金的初始微观结构

Fig.2 Initial microstructure of CoCrNiSi0.3C0.048 MEA

图3 晶体坐标系到样品坐标系的转化过程

Fig.3 The rotation from the crystal coordinate system to the sample coordinate system

图4 3D RVE模型的边界条件

Fig.4 Boundary conditions of the 3D RVE model

图5 析出相体积分数为5%的3D RVE微观结构模型

Fig.5 3D RVE microstructure model with 5% volume fraction of precipitated phase

表1 CoCrNiSi0.3C0.048晶体塑性相关参数

Table 1 CoCrNiSi0.3C0.048 crystal plastic model related parameters

参数	数值	参数	数值
${C}_{11}^{matrix}$/GPa	245	α	0.0008
${C}_{11}^{1}$/GPa	477	${\tau }_{0}^{1}$/MPa	183
m	10	r₂/nm	500
${h}_{0}^{2}$/MPa	51	f₃	0.1
μ₁,μ₂/GPa	299	${C}_{44}^{matrix}$/GPa	142
τ₀/MPa	92.7	${C}_{44}^{1}$/GPa	137
b₂, b₃/nm	0.43	h₀/MPa	51
f₂	0.1	APB₂,APB₃/(J·m^-2)	0.5
${C}_{12}^{matrix}$/GPa	156	β	0.143
${C}_{12}^{1}$/GPa	198	τ_s/MPa	215
${\stackrel{·}{\gamma }}_{0}$/s^-1	0.001	r₃/nm	50
${\tau }_{s}^{1}$/MPa	1150

图6 CoCrNiSi0.3C0.048在$\stackrel{·}{\epsilon }$=3000s-1下的动态压缩实验与CPFEM模拟结果的力学响应

Fig.6 The dynamic compression experiment of CoCrNiSi0.3C0.048 at $\stackrel{·}{\epsilon }$= 3000s-1 and the mechanical response of CPFEM simulation results

图7 FCC金属中6种典型织构在动态压缩下应力-应变($\stackrel{·}{\epsilon }$=3×103s-1)

Fig.7 Uniaxial dynamic compression of six typical textures in FCC metal (strain rate 3×103s-1)

图8 随机织构织构演化

Fig.8 Texture evolution of random texture

图9 铜织构的织构演化

Fig.9 Texture evolution of copper texture

图10 立方织构的织构演化

Fig.10 Texture evolution of Cube texture

图11 黄铜织构的织构演化

Fig.11 Texture evolution of Brass texture

图12 高斯织构的织构演化

Fig.12 Texture evolution of Goss texture

图13 旋转高斯织构的织构演化

Fig.13 Texture evolution of Rot.Goss texture

图14 特征晶粒与析出相的微观结构分布

Fig.14 The microstructure distribution of characteristic grains and precipitated phases

图15 FCC金属中基体特征晶粒6种典型织构在动态压缩下应力应变($\stackrel{·}{\epsilon }$=3×103s-1)

Fig.15 Stress-strain of six typical textures of selected single grain in FCC metal under dynamic compression (strain rate 3×103s-1)

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