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Which of the following represents the extrinsic stacking fault in the FCC Metal?

Which of the following represents the extrinsic stacking fault in the FCC Metal? Correct Answer ABCACBCABC

The extrinsic stacking fault is equivalent of inserting extra plane in the stacking sequence of FCC. In ABCA|C|BCABC, the plane C is extra, and it creates the twin region around the fault and also called twin stacking fault.

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