5. Consider the solidification of a binary Mg-5% Al alloy. The melt is initially at 1000K. Assume that during solidification, there is complete mixing in the liquid and no diffusion in the solid. Use the phase diagram below to answer the following questions: 1000 900 00 800 Temperature (K) 600 00 700 700 α 500 400 Liquid В γ 300 0 0.1 0.2 0.3 0.4 0.5 0.6 Mole fraction Al 0.7 0.8 0.9 1.0 10 (a) What is the mole fraction of liquid remaining at 750 K? (b) At what temperature is solidification complete? (c) Do you expect y to be present in the as-cast microstructure? Explain

Elements Of Electromagnetics
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5. Consider the solidification of a binary Mg-5% Al alloy. The melt is initially at 1000K.
Assume that during solidification, there is complete mixing in the liquid and no diffusion
in the solid. Use the phase diagram below to answer the following questions:
1000
900
00
800
Temperature (K)
600
00
700
700
α
500
400
Liquid
В
γ
300
0 0.1 0.2 0.3
0.4 0.5 0.6
Mole fraction Al
0.7 0.8
0.9 1.0
10
(a) What is the mole fraction of liquid remaining at 750 K?
(b) At what temperature is solidification complete?
(c) Do you expect y to be present in the as-cast microstructure? Explain
Transcribed Image Text:5. Consider the solidification of a binary Mg-5% Al alloy. The melt is initially at 1000K. Assume that during solidification, there is complete mixing in the liquid and no diffusion in the solid. Use the phase diagram below to answer the following questions: 1000 900 00 800 Temperature (K) 600 00 700 700 α 500 400 Liquid В γ 300 0 0.1 0.2 0.3 0.4 0.5 0.6 Mole fraction Al 0.7 0.8 0.9 1.0 10 (a) What is the mole fraction of liquid remaining at 750 K? (b) At what temperature is solidification complete? (c) Do you expect y to be present in the as-cast microstructure? Explain
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