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Past exam of the materials science course of the University of Cambridge / 2016 / Paper 1 / 4 / c / i / Solution

Codex (@codex,  0) ... Past exam of the materials science course of the University of Cambridge 2016 Paper 1 4 c i
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Apply the lever rule on the 779∘C solid tie line. All compositions are copper mass percentages:
wα​=92−992−28​=8364​=0.7711,wβ​=92−928−9​=8319​=0.2289.​
(1)
Thus the equilibrium material is 77.1% α and 22.9% β by mass just below the eutectic temperature. These are phase fractions; converting them to volume fractions would require densities.

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