Fe-Cr合金气泡演化动力学的相场法模拟

刘彩艳, 冯泽华, 张云鹏, 余康, 吴璐, 马聪, 张静

Phase Field Simulation of Bubble Evolution Dynamics in Fe-Cr Alloys

LIU Caiyan, FENG Zehua, ZHANG Yunpeng, YU Kang, WU Lu, MA Cong, ZHANG Jing

表1 模型中采用的无量纲化参数

Table 1 The dimensionless parameters used in the model

Parameter Symbol Value Characteristic time t0 5 × 10-3 s Characteristic length l0 0.5 nm Coefficient of chemical free energy fv* 1.651 fg* 0.100 fb* -0.29 b0 -0.08736[15] b1 0.2663[15] b2 0.2559[15] b3 0.032 Solubility of vacancy Cv0 0.012 Solubility of gas atom Cg0 0.032 Gas gradient coefficient κg* 0.05 Vacancy gradient coefficient κv* 0.05 Elastic constant C11 in fcc iron 154 GPa C12 in fcc iron 122 GPa C44 in fcc iron 77 GPa C11 in fcc chrome 249 GPa C12 in fcc chrome 178 GPa C44 in fcc chrome 143 GPa Expansion coefficient of vacancy εvac0 -0.05 Expansion coefficient of gas atom εgas0 0.05