Question:
Self-diffusion in FCC metals occurs mainly by one of the following mechanisms
Self-diffusion in FCC metals occurs mainly by one of the following mechanisms
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Vacancy diffusion is for same-sized atoms; Interstitial is for small "guest" atoms.
Updated On: Jul 4, 2026
- Interstitial
- Substitutional
- Inter-Substitutional
- Vacancy
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The Correct Option is D
Solution and Explanation
Step 1: Concept
Diffusion is the transport of material by atomic motion within a solid lattice.
Step 2: Meaning
In self-diffusion, atoms of the same type move through the crystal.
Step 3: Analysis
Interstitial diffusion occurs for very small atoms (like Carbon in Iron). In close-packed FCC metals, there is insufficient space for same-sized atoms to move between sites. Movement is only possible when an atom jumps into an adjacent empty lattice site.
Step 4: Conclusion
Consequently, the vacancy mechanism is the dominant mode of self-diffusion in FCC metals. Final Answer: (D)
Diffusion is the transport of material by atomic motion within a solid lattice.
Step 2: Meaning
In self-diffusion, atoms of the same type move through the crystal.
Step 3: Analysis
Interstitial diffusion occurs for very small atoms (like Carbon in Iron). In close-packed FCC metals, there is insufficient space for same-sized atoms to move between sites. Movement is only possible when an atom jumps into an adjacent empty lattice site.
Step 4: Conclusion
Consequently, the vacancy mechanism is the dominant mode of self-diffusion in FCC metals. Final Answer: (D)
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