Investigations on the Fatigue Behavior of Nanocrystalline Metals

Abstract:

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 [7] 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.

• Periodical: Key Engineering Materials (Volume 465)
• Pages: 207-210
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.465.207
• Online since: January 2011
• Authors: Matthias Funk, Christoph Eberl
• Keywords: Fatigue, Fourier Transformation, Higher Harmonics, Nanocrystalline, Nickel, Reliability

References

[1] E. Ma, Science (2004) 623 – 624.

[2] M. Jin, A. M. Minor, E.A. Stach, J.W. Morris Jr., Acta Mat. 52 (2004) 5381 – 5387.

[3] J. W. Cahn, Y. Mishin, A. Suzuki, Acta Mat. 54 (2006) 4953-4975.

[4] S.R. Agnew, J.R. Weertman, MSE A 244 (1998) 145-153.

[5] B. Moser, T. Hanlon, K.S. Kumar, S. Suresh, Scr. Mat. 54 (2006) 1151 - 1155.

[6] P. Starke, F. Walther, E. Eifler, Int. J. of Fat. 28 (2006) 1028 – 1036.

[7] D. Dengl, H. Harig, Fat. Eng. Mat. Str. 3 (1980) 113-128.

[8] M. Wilhelm, D. Maring, H. -W. Spiess, Rheol. Acta 37 (1998) 399-405.

[9] A. Malkin, Rheol. Acta 34 (1995) 27 - 39.

[10] D. van Dusschoten, M. Wilhelm, Rheol. Acta 40 (2001) 395-399.

[11] J. Aktaa, J. Th. Reszat, M. Walter, K. Bade, K.J. Hemker, Scripta Mat. 52 (2005) 1217 – 1221.

DOI: 10.1016/j.scriptamat.2005.03.004

[12] P. Starke, F. Walther, E. Eifler, MSE A 523 (2009) 246-252.