Yield strength of a polycrystalline metal with an average grain size „d', is proportional to ____________________?
Correct answer: B. d-1/2
- A. d1/2
- B. d-1/2
- C. d
- D. d-1
Explanation
The Hall-Petch relation states that yield strength increases as grain size decreases: σy = σ0 + k d^-1/2. Thus, the grain-size-dependent term is proportional to d^-1/2.
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