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Tensile stress–strain curves of (a) nanocrystalline and (b) nanocrystalline Co tested at room temperature and . The insets show the corresponding curves for the reference coarse-grained material for comparison.
TEM bright-field micrographs of (a) nanocrystalline nickel and (b) nanocrystalline cobalt with average grain size of 29 and , respectively.
Stress relaxation curves for nc and nc at RT. Because the slope scales with (Ref. 12), the apparent activation volume can be derived from the slope of the linear fit to the data in the plots shown in the insets ( for nc and for nc ), by using . The strain rate sensitivity, , can also be determined ( for nc and 0.025 for nc ).
Yield strength (0.2% offset ) of nc and nc in comparison with their references.
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