Question: Using Figure 12.23 (below), draw representative equilibrium microstructures for a 40wt% Al2O3 alloy at each of the following temperatures: 2800C, 2200C, 1980C, 1500C. In your

Using Figure 12.23 (below), draw representative equilibrium microstructures for a 40wt% Al2O3 alloy at each of the following temperatures: 2800C, 2200C, 1980C, 1500C. In your drawings, be as accurate as possible regarding the relative amounts of each phase.

Composition (mol% Al2O3) 20 40 60 80 2800 5000 Liquid 4500 2400 Mgo (ss) MgAl204 (ss) + Liquid Al2O3 Liquid + Liquid 4000 Temperature (C) Mgo (ss) 2000 Temperature (F) 3500 MgA1204 (ss) 3000 1600 Mgo (ss) + MgA120A (ss) MgA1204 (ss) 2500 Al2O3 1200 2000 0 20 80 40 60 Composition (wt% A1,03) 100 (A1203) (Mgo)

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