Abstract
The effects of grain size ( d ), specimen size ( t ) and initial dislocation density on the strength of micron-sized polycrystals are simulated by two-dimensional dislocation dynamics. The results show that the continuum phenomenon of “smaller being weaker” effect for 1 t / d ⪝ 3 occurs only when the initial dislocation density is high. When t / d t / d , the opposite “smaller being stronger” effect occurs.
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