Is there any difference in the tendency for shrinkage void f

Is there any difference in the tendency for shrinkage void formation in metals with short and long freezing ranges, respectively? Explain.

Solution

Consider an alloy poured into a mold, where the exterior solidified and a solidification front progresses towards the casting center. In an alloy with a large freezing range, the presence of a large mushy zone is more likely to occur and, thus, the formation of microporosity. However, in an alloy with a short freezing range, the formation of gross shrinkage voids is more likely to occur near the center of the casting. The total porosity is the same in this case. With proper gating and riser design, the porosity for the short freezing range alloy is easier to eliminate or control