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Chapter 4: Problem 44

For each of the following stacking sequences found in FCC metals, cite the type of planar defect that exists: (a)...ABCABCBACBA... (b) ... ABCABCBCABC... Copy the stacking sequences and indicate the position(s) of planar defect(s) with a vertical dashed line.

Short Answer

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a) ...ABCABCBACBA... b) ...ABCABCBCABC... Answer: Both stacking sequences (a) and (b) contain a Stacking Fault. For sequence (a), the defect is located at the transition from the 2nd A to the C layer, indicated as ...ABC|ABCBAC|BA... For sequence (b), the defect is located at the transition from the C layer to the second B layer, indicated as ...ABCABC|BC|ABC...

Step by step solution

01

Identify defects in stacking sequence (a)

In the given stacking sequence (a), we are looking for deviations from the standard ABCABC pattern for FCC metals. Stacking sequence (a): ...ABCABCBACBA...
02

Mark the position of defect(s) in sequence (a)

The deviation from the ABCABC pattern appears at the transition from the 2nd A to the C layer. Mark the stacking sequence (a) with the position of the defect: ...ABC|ABCBAC|BA...
03

Identify the type of planar defect in sequence (a)

In stacking sequence (a), there is a missing C layer. This type of planar defect is known as a Stacking Fault.
04

Identify defects in stacking sequence (b)

In the given stacking sequence (b), we are looking for deviations from the standard ABCABC pattern for FCC metals. Stacking sequence (b): ...ABCABCBCABC...
05

Mark the position of defect(s) in sequence (b)

The deviation from the ABCABC pattern appears at the transition from the C layer to the second B layer. Mark the stacking sequence (b) with the position of the defect: ...ABCABC|BC|ABC...
06

Identify the type of planar defect in sequence (b)

In stacking sequence (b), two consecutive B layers occur instead of the normal ABC pattern. This type of planar defect is a Stacking Fault. In summary: - Stacking sequence (a): ...ABC|ABCBAC|BA... - Stacking Fault - Stacking sequence (b): ...ABCABC|BC|ABC... - Stacking Fault

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Most popular questions from this chapter

Determine the ASTM grain-size number if 25 grains per square inch are measured at a magnification of \(75 \times\).

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