位错密度梯度结构Cu单晶微柱压缩的三维离散位错动力学模拟

熊健,魏德安,陆宋江,阚前华,康国政,张旭

A Three-Dimensional Discrete Dislocation Dynamics Simulation on Micropillar Compression of Single Crystal Copper with Dislocation Density Gradient

Jian XIONG,Dean WEI,Songjiang LU,Qianhua KAN,Guozheng KANG,Xu ZHANG

表2 Cu单晶微柱离散位错动力学模拟的材料参数

Table 2 Material parameters used in the discrete dislocation dynamics simulation

Parameter Value Unit Burgers vector (b) 0.256 nm Mean dislocation density (ρ) 76.5 1012 m-2 Mean dislocation source length (lFRS) 400 nm Poisson's ratio (ν) 0.324 - Shear modulus (μ) 54.6 GPa Drag coefficient (B) 1×10-4 Pa·s