3. An aluminum slab of 10 20.5m has a hydrogen content of 0:15 ccsTp/100 g of metal. a) Compute the total volume of pores if equilibrium conditions until the end of solidification are assumed. b) What is the corresponding fraction of porosity? Perform this calculation for two alloys, Al-7wt%Si and Al-4wt%Mg, using the solubilities given in Fig.1. - Pure Al o Al-7wt%Si a Al-12.5wt%Si Al-4wt%Mg 2.5 1.5 1 0.5 400 500 600 700 800 900 T (C] Fig. 12.11 The equilibrium composition of hydrogen in molten aluminum as a func- tion of the temperature, showing the effect of Si and Mg additions. Fig.1 The equilibrium composition of hydrogen in molten Al as a function of the temperature, showing the effect of Si and Mg alloying elements additions.