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Where does the solidification in a phase diagram start?

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in Engineering Material & Metallurgy by (773k points)
Where does the solidification in a phase diagram start?

(a) Liquidus line

(b) Solidus line

(c) At equilibrium

(d) At freezing point

The question was asked during an interview.

This question is from Nucleation, Growth and Segregation, Recovery, Recrystallisation and Grain Growth in section Mechanical Working Processes & Phase Transformations of Engineering Material & Metallurgy

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Best answer
Correct option is (a) Liquidus line

The best explanation: In a phase diagram, two phases are known as liquidus and solidus exist. Liquidus line is that line above which the alloy is in a liquid state and where solidification starts. At solidus line, the alloy is in solid state and solidification is complete.

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