Stacking sequence in face centered cubic (FCC) close packed structure is?

Stacking sequence in face centered cubic (FCC) close packed structure is?

Right Answer is:

ABCABC

SOLUTION

The stacking sequence in face centered cubic (FCC) close packed structure is ABCABC.

  • In the FCC structure, close-packed planes are of the form (111).
  • When parallel (111) planes are stacked, atoms in-plane B fit over valleys in plane A and atoms in plane C fit over valleys in both planes A and B.

FCC-stacking-sequence

  • The fourth plane fits directly over atoms in plane A.
  • Consequently, a stacking sequence… ABCABCABC. ..is produced using the (111) plane.
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