Consider the hypothetical eutectic phase diagram for metals A and B, which is similar to that for

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Consider the hypothetical eutectic phase diagram for metals A and B, which is similar to that for the lead-tin system, Figure. Assume that

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(1) ? and ? phases exist at the A and B extremities of the phase diagram, respectively;

(2) The eutectic composition is 47 wt% B-53 wt% A; and

(3) The composition of the ? phase at the eutectic temperature is 92.6 wt% B-7.4 wt% A. Determine the composition of an alloy that will yield primary ? and total ? mass fractions of 0.356 and 0.693, respectively.

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