An alloy of 73.9 atomic % tin (Sn) and 26.1 atomic % lead (Pb) is mixed and heated to 250°C. See the lead tin phase diagram in Figure 5.11a.
(a) At 250°C what phases are present, what are their chemical compositions, and what is the atom fraction of each phase?
(b) This Pb-Sn mixture is then cooled to room temperature (25°C). What phases are present, what are their chemical compositions, and what is the atom fraction of each phase present?
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