Abstract
The use of triboindentation testing enables a dynamic range of testing that can span more than eight orders of magnitude in strain rate. The mechanical response of a gold–nickel nanocrystalline nanolaminate is investigated as it is subjected to high strain-rate conditions using the nanoscratch test method. The scratch hardness measurements are compared for scratch widths above which the contributions from grain size and layer pair spacing reaches a plateau and representative interface spacing. It is found that the strain-rate sensitivity increases rapidly beyond a 10+3s−1 strain rate indicative of superplastic behavior.
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