Modeling of microporosity formation and hydrogen concentration evolution during solidification of an Al

Modeling of microporosity formation and hydrogen concentration evolution during solidification of an Al–Si alloy

Zhang Qingyu^{1, 2, †}, Sun Dongke³, Zhang Shunhu¹, Wang Hui⁴, Zhu Mingfang^{2, ‡}

Simulated equiaxed dendrite growth and gas pore formation for an Al–(5 wt.%)Si alloy with different initial hydrogen concentrations (C_H0): (a)–(d) C_H0 = 0.02; (a) f_g = 0%, f_s = 0.21, T = 613.7 °C; (b) f_g = 0%, f_s = 0.43, T = 608.0 °C; (c) f_g = 0.09%, f_s = 0.65, T = 586.4 °C; (d) f_g = 0.66%, f_s = 0.68, T = 570.9 °C; (e)–(h) C_H0 = 0.026; (e) f_g = 0%, f_s = 0.21, T = 613.7 °C; (f) f_g = 0.11%, f_s = 0.43, T = 608.0 °C; (g) f_g = 1.86%, f_s = 0.65, T = 586.4 °C; (h) f_g = 1.91%, f_s = 0.68, T = 570.9 °C. f_g, f_s, and T are the total porosity percentage, solid fraction, and temperature in the domain, respectively. The numbers in the panels indicate the local concentrations of hydrogen in the melt.