List of top Engineering Materials Science Questions on Phase Diagrams

An Iron-Carbon alloy at room temperature has pro-eutectoid ferrite as a constituent in the microstructure, that formed above the eutectoid temperature. The alloy also has pearlite as another constituent that has formed below eutectoid temperature.
Which ONE of the following best describes this Iron-Carbon alloy?
A binary A-B alloy has \( \alpha \) and \( \beta \) phases at equilibrium. The ratio of weight percentages (wt.%) of \( \alpha \) to \( \beta \) is 4. The wt.% of A in \( \alpha \) and \( \beta \) phases is 70 and 20, respectively. The wt.% of B in the alloy is \(\underline{\hspace{2cm}}\) (round off to nearest integer).