Please explain in detail how these answers are obtained Question: Consider a mol

Question

Please explain in detail how these answers are obtained

Question: Consider a molten alloy of Pb-Sn containing 20 wt% Sn at a temperature of 350C. We assume that Pb and Sn are homogeneously mixed in the liquid phase.Next, consider what happens as the melt is slowly cooled to room temperature. What is the composition of the last liquid just before solidification is complete? a) 18.3 wt % Sn b) 20wt % Sn c 61.9 wt% Sn d) 100 wt % Sn Question: How much of the alpha (a) structure is formed during slow cooling of an alloy containing 20 wt% Sn from 35°C to room temperature? a) 100 wt% b) 96.1 wt% c) 61.9 wt% d) 18.3 wt %

Explanation / Answer

1. From the phase equlibrium diagram, we see that the composition at eutectic temperature is 61.9% Sn and eutectic temeperature is the temperature of minimum melting point, hence the composition of last liquid before solidification is complete is 61.9% Sn.

2. Again ,looking at the phase diagram, we find that the on cooling from 350°C to room temperature, the alpha phase solidification line is intersected at 96.1% and rest is beta phase.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---