Spring 2018 Materials Science Quiz 6 Chapter 10 Solution PDF

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Name:_______________________________ QUIZ #6—CHAPTER 10 MATERIALS SCIENCE Spring 2018 ❖ Directions Make sure that you write legibly and show all your work. Circle your final answers. ❖ Problem 1 Using the phase diagram for the Sn-Pb system, determine the following:

a) (2 pts) What is the eutectic temperature for this system?

b) (1 pts) What phases will be present for an alloy for composition 20 wt% Sn – 80 wt% Pb that is at equilibrium at 250oC?

c) (1 pts) What phases will be present for an alloy of composition 75 wt% Sn- 25 wt% Pb that is at equilibrium at 190oC?

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Name:_______________________________ d) (2 pts) For an alloy of composition 10 wt% Sn- 90 wt% Pb that is initially at 225oC, at what temperature will the first solid beta will form upon cooling?

e) A lead–tin alloy of composition 40 wt% Sn–60 wt% Pb is slowly heated from a temperature of 100°C. a. (2 pts) At what temperature does the first liquid phase form?

b. (2 pts) What is the composition of this liquid phase for this alloy?

c. (2 pts) At what temperature does complete melting of this alloy occur?

d. (3 pts) What is the composition of the last solid remaining prior to complete melting for this alloy?

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