MAE4500_HW3_Sol - Manufacturing Methods MAE 4500 Fall...

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Manufacturing Methods MAE 4500 Fall Semester 2009 Solutions to Homework #3 1. A part given in figure 1 is to be made by casting. The following materials are considered: Al- 3%Si and Al-12.6%Si. a) Copy the Al-Si equilibrium diagram and identify all phase fields. b) Make two sketches showing the solidification of each of the above two alloys in cylindrical molds (type of crystals, solidification shrinkage). c)Make judgments on each material whether it will be: i. Prone to alloying element segregation ii. suffer from microporosity iii. easy to feed iv. of high fluidity (Give your answers for each material in the above sequence; justify each answer in one sentence.) d)On the above basis, evaluate each material for its suitability for casting. Solution :
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a) b) From figure 3-15 a and b of Schey c) i. Al-3%Si: prone to both micro and macro-segregation due to its wide solidification range which causes dendritic solidification pattern. (Dendrites have a lower alloying element
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concentration) Al-12.6%Si: prone to normal segregation (macrosegregation) due to planar solidification
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