For a 55 wt% Pb–45 wt% Mg alloy slowly cooled from 700°C to 300°C, at what temperature does the first solid phase form?

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answer : 550°c

Explanation:

From the phase diagram attached we can see that at point between 500° and 600°  i.e.550°c  on the phase diagram the first solid phase was form when a 55 wt% Pb-45 wt% Mg alloy slowly cools down from 700 to 300°c

answer:

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explanation: