On the phase diagram tor a Pb-Sn alloy system. Consider an alloy that contains 3

Question

On the phase diagram tor a Pb-Sn alloy system. Consider an alloy that contains 30 wt% Sn, and assume that you are slowly heating this alloy from 150 degree C. What phases would you expect at 150 degree C? As you slowly heat this alloy from 150 degree C. at what temperature does the first liquid phase form? What is the composition of this liquid phase that forms first? At what temperature does complete melting of the alloy occur? What is the composition of the last solid remaining prior to complete melting?

Explanation / Answer

a) You will expect the "alpha" and "beta" phases, which varies in Pb-Sn composition.
b) At 183 C, which is called the eutectic.
c) 61.9% Sn (tin).
d) At 372C.
e) Pb (lead)

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