18. Referring to the Chart 1, nickel and copper form a complete solid solution a

Question

18. Referring to the Chart 1, nickel and copper form a complete solid solution a. Is there a eutectic point shown? b. What is the melting point of pure Ni? c. What is the melting point of pure Cu? d. At 1200 C, what is the highest weight percent Cu possible in the L phase? e. At 1200 C, what is the lowest weight percent Ni possible in the o phase? f. At 1400 C, what is the lowest atomic percent Cu possible in the a phase? g. At 1400 C, for an overall 80 weight percent Ni alloy, what phase has the largest mass fraction?

Explanation / Answer

No eutectic points in this binary system,

The melting point of pure Ni is 1455 C

The melting point of pure Cu is 1084.87 C

In L phase, at 1200 C, highest weight % is 80%

In Alpha phase, at 1200 C, lowest weight % of Ni is 30%

In Alpha phase, at 1400 C, lowest atom % of Cu is 0%

At 1400 C, weight % of Ni is 80%, L -phase has highest weight%

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