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 under different cooling rates (CRs): (a)–(d) CR = 2 °C/s; (a) f_g = 0%, f_s = 0.21, T = 621.2 °C; (b) f_g = 0.27%, f_s = 0.51, T = 604.4 °C; (c) f_g = 0.96%, f_s = 0.58, T = 596.0 °C; (d) f_g = 1.47%, f_s = 0.68, T = 575.9 °C; (e)–(h) CR = 12 °C/s; (e) f_g = 0%, f_s = 0.21, T = 613.7 °C; (f) f_g = 0.41%, f_s = 0.59, T = 594.7 °C; (g) f_g = 0.64%, F_s = 0.62, T = 591.0 °C; (h) f_g = 0.99%, 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.