During additive manufacturing of a nickel-based superalloy turbine blade operating at high temperature, which consequence results from excessive Hall-Petch strengthening?

💡 Explanation

Excessive Hall-Petch strengthening refines the grain size, leading to increased lattice distortion and embrittlement, because the mechanism increases dislocation density and hinders movement; therefore, embrittlement occurs rather than creep resistance, which is more associated with larger grains.

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