Explain which kind of microstructures you expect to observe at room temperature if an iron-carbon alloy of eutectoid composition is cooled down following the red and blue curves. 800 727° 700 Coarse pearlite 600 a+ Fe, C Fine pearlite 50 y+a+ Fe, C 400 Bainite 300 200 so -Mo 100 1 min I hour 1 day 1 sec 102 105 10 103 104 0.1 Time, seconds

A gate oxide is grown in 640 torr of water vapour at 1050o C. The oxide is grown on a bare (100) silicon wafer. The oxidation time is 2 mins. i) Assuming the tau (τ) value is zero, use the Deal–Grove model to predict the oxide thickness. Do not use design curves. For simplicity, when estimating B and B/A, assume the values are a linear function of temperature, rather than the actual exponential function. ii) When this process is run, the measured oxide thickness is 0.1 µm, but the oxidation rate after 2 mins agrees with the B/A ratio. Find the value of τ that should be used for these process conditions to allow for the initial rapid growth regime

In Figure below if a metlic c:ube of a 1 2 inch side length weighing 46 kg, floats at a two layer fluids mercury and sea water. Detennine the position of the block at mercury- water interface when it has reached equilibrium. (mass density of sea water ; 63.92623 lb/fts) and for mercurv : 845 lb/ftS).

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