Examine Figure 12-10 and state the phases that will be present in each stage if this process path is followed: (500°C, 20 wt% Mg) to (500°C, 80 wt% Mg) to (200°C, 80 wt% Mg).

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600 °C 400 200 Al 20 660.37° α a + L 14.9 a + ß 451° Atomic percent magnesium 40 60 20 35.5 B- 35.0 Y 322 L 59.8 Y 67.7 437⁰ y+8 80 40 60 Weight percent magnesium 8 + L 87.3 80 649⁰ 8 Mg 1200 1000 800 700 500 300 °F