Why Can't Chromium and Nickel Form a Miscible Solid Solution

question 17

Multiple Choice

Why can't chromium and nickel form a miscible solid solution over the entire composition range?

• A) The lever rule says that these two metals can't coexist in an alloy.
• B) The two metals crystallize into different cubic structures in their pure forms.
• C) The tetrahedral holes in the nickel crystal are not large enough to accommodate the chromium.
• D) The octahedral holes in the chromium crystal are not large enough to accommodate the nickel.
• E) Chromium atoms can only fit inside tetrahedral holes, which are not present in the structure of pure nickel.

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