Investigations on the Fatigue Behavior of Nanocrystalline Metals
In this paper data on fatigue lifetime of nanocrystalline (nc) Ni samples is presented. The nc-Ni samples show high lifetimes and can resist large stress amplitudes. Furthermore a new method to determine the fatigue limit based on a Fourier analysis  is presented. First results of a load increase test suggest strong parallels to thermal and resistive measurements which can be used to determine the fatigue limit. Microstructural investigations on as received and failed samples show a strong increase in grain size induced by the cyclic loading. The processes behind this are not understood so far and will be investigated in the future.
M. Funk and C. Eberl, "Investigations on the Fatigue Behavior of Nanocrystalline Metals", Key Engineering Materials, Vol. 465, pp. 207-210, 2011