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) None of the above is true.

Question

Quizplus · Accepted Answer

Chromium and nickel crystallize into different cubic structures in their pure forms, which affects their ability to form a miscible solid solution over the entire composition range. Chromium has a body-centered cubic (BCC) structure, while nickel has a face-centered cubic (FCC) structure. This difference in crystal structures leads to incompatibility in forming a continuous solid solution across all compositions.

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