4. Construct a phase diagram of Sn-Zn, if it is known that the melting point of Sn is 232 C, and Zn is -418 C. The eutectic alloy contains 8% Zn, and melts at 200 C. From the diagram, determine how many degrees of freedom the following compositions have at the corresponding temperatures:
Zn, weight%, 5 20 60
t, C 250 170 300
What phases exist at given temperatures?

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