Question

Q. 9 A 34.6% Pb-Sn alloy is cooled
just below the eutectic temperature
(183°C). What is the fraction of
proeutectic a and eutectic mixture
(a+b)?
O 70% and 30%
O
64% and 36%
O 36% and 64%
O 30% and 70%​

Answer 1

Answer:

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Answer 2

Answer:

B

Explanation:

The eutectic point is at 61.9%

Sn and α boundary are at 19.2% Sn.

Apply the lever rule % proeutectic α= 100*(61.9 – 34.6)/(61.9 – 19.2) = 64 % (α + β) = 100* (34.6 – 19.2)/(61.9 – 19.2) = 36%.

hope that will help you