ptical micrographs showing the effect of excess Mg on the as-cast microstructure of Al–7.8 wt%Mg2Si (Al–4.95 wt%Mg–2.86 wt%Si) alloy with (a) 1.9 wt%Mg, (b) 4.1 wt%Mg, (c) 5.8 wt%Mg, and (d) 7.6 wt% Mg
ptical micrographs showing the effect of excess Mg on the as-cast microstructure of Al–7.8 wt%Mg2Si (Al–4.95 wt%Mg–2.86 wt%Si) alloy with (a) 1.9 wt%Mg, (b) 4.1 wt%Mg, (c) 5.8 wt%Mg, and (d) 7.6 wt% Mg