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What is the effect of grain size on ductility?

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Here is a classic answer: the hall-patch relation describes that the yield strength of a material increases proportional to squareroot of the grain size. Hall-Patch is the only classic strengthening mechanism that DOES NOT reduce ductility. read more

Coming back to the original question: in principle there is no relation between grain size and ductility, although in some metals, e.g. in (HCP) Mg, a finer grain size does help to achieve more ductility as already pointed out above. read more

so with grain size finer, the ductility is more which is sometimes confusing after knowing the hall petch relation. when metals subjected to loading ductile materials will tend to shear off (cup and cone fracture) . microscopically the grains gets sheared off. read more

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Why is fine grain crystal more ductile than the coarse ...
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