Referring to the same Al-Mg diagram , but assuming a 10 wt% Mg liquid solution a

Question

Referring to the same Al-Mg diagram, but assuming a 10 wt% Mg liquid solution at 650°C, answer the following questions.

(a)    Upon cooling, at what temperature do the first solids appear and what is their composition?

(b)   At 450°C, describe the phases that are present at equilibrium in terms of their composition and relative amounts.

(c)    Repeat the above description at 300°C, and sketch a possible microstructure of the system.

Atomic percentage, magnesium 50 10 20 30 40 60 70 80 90 100 700 660.452 650 600 500 35.6 455 450° 17.1 59.866.7 87.4 400 36.1 300 200 100 Al 10 20 30 40 50 60 80 90 Mg Weight percentage, magnesium

Explanation / Answer

(a) The first solid will appear at 660.452 and the composition will be 10% Al and 90% Mg.

(b) At 450 degree celcius liquid and solid phases are present in equilibrium and the composition will be 35% Al and 65% Mg.

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