Effect of Irradiation on Mechanical Properties of Polycrystalline Copper: Crystal Plasticity Finite Element Method

doi:10.19596/j.cnki.1001-246x.8342

Abstract

Abstract:

Based on irradiation hardening theory and crystal plasticity theory, tensile process of irradiated polycrystalline copper was simulated with ABAQUS finite element analysis software. Effects of irradiation on mechanical properties of materials such as yield strength, hardening process, crystal deformation are analyzed. Temporal evolution and spatial distribution of dislocation density are studied. It shows that: The yield stress of polycrystalline copper is increased with irradiation and hardening and softening phenomena in different stages are affected. The increase of irradiation dose slows the proliferation of dislocation density, and increases its spatial inhomogeneity. Plastic deformation and crystal rotation are also affected by irradiation. Under same strain condition, the greater the irradiation dose is, the greater the deformation degree is and the greater the inhomogeneity of plastic deformation distribution is. Meanwhile, with the increase of irradiation dose, the degree of crystal rotation and angular dispersion increases.

Key words: crystal plasticity finite element, irradiation effect, dislocation, deformation

Hongming LI, Maosheng LI. Effect of Irradiation on Mechanical Properties of Polycrystalline Copper: Crystal Plasticity Finite Element Method[J]. Chinese Journal of Computational Physics, 2022, 39(1): 6-16.

Figures/Tables 10

Fig.1 (a) Polycrystalline model; (b) Loading direction and boundary conditions

Table 1 Physical parameters

参量	符号	含义	值	单位
	k₁	位错增殖系数	2×10⁹	m^－1
	χ	相互作用参数	0.9
Kocks-Mecking参数	g	归一化激活能	0.15
Kocks-Mecking参数	k_B	玻尔兹曼常数	1.38×10^-23	J·K^-1
	D	拖曳力	2.5×10⁸	Pa
	$ \dot{\varepsilon}_0$	参考应变率	1×10⁷	s^－1
	η	辐照缺陷湮灭效率	20
	h_n	位错相互作用自硬化系数	0.5
	h_d	位错与缺陷相互作用系数	0.25
可调系数	τ₀	晶格固有阻力	0	Pa
	m	敏感因子	0.1
	$ \dot{\gamma}_0$	参考剪切应变率	0.001	s^－1
	p_ann	缺陷湮灭概率	4.2811×10^-4

Fig.2 Stress-strain curves under different irradiation doses

Fig.3 Contour plots of dislocation density without irradiation (a) (1 1 1)[0-1 1]slip system dislocation; (b) (-1 1 1)[1 1 0]slip system dislocation

Fig.4 Contour plots of average dislocation density of each slip system (a) no irradiation; (b) 0.1dpa

Fig.5 Evolution of average dislocation density under different irradiation conditions

Fig.6 Contour plots and frequency statistics of cumulative shear strain distribution (a) no irradiation; (b) no irradiation; (c) 0.1 dpa; (d) 0.1 dpa

Fig.7 Gaussian distribution of cumulative shear strain under different irradiation doses

Fig.8 Contour plots of misorientation under different irradiation doses (a) no irradiation; (b) 0.005 dpa; (c) 0.01 dpa; (d) 0.1 dpa

Fig.9 Gaussian distribution fitting curves of misorientation under different irradiation doses

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