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The crystal structures of three metals are shown opposite - Leaving Cert Engineering - Question a - 2021
Question a
The crystal structures of three metals are shown opposite. (i) Identify the crystal structures A, B and C. (ii) Explain why crystal structure B is likely to be mor... show full transcript
Worked Solution & Example Answer:The crystal structures of three metals are shown opposite - Leaving Cert Engineering - Question a - 2021
Step 1
Step 2
Explain why crystal structure B is likely to be more ductile than crystal structure A.
Answer
Crystal structure B (FCC) is likely to be more ductile than crystal structure A (BCC) due to its atomic arrangement. The FCC structure has a larger number of slip systems, which allows for easier deformation under stress. Specifically, the FCC lattice has four atoms per unit cell, as opposed to the two in the BCC structure. The greater number of atoms facilitates multiple slip planes, permitting greater plasticity, thereby enhancing ductility.
Step 3
Describe two possible crystal point defects which may occur during metal solidification.
Answer
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Substitute Defect: This defect occurs when foreign atoms replace the parent atoms in the lattice structure.
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Vacancy Defect: This defect arises when there is an absence of an atom in the lattice, leading to a vacancy in the crystal structure.