Abstract
Low cycle fatigue data are reported for multicrystalline specimens (i.e. polycrystals with a few large grains in the gauge section) of age-hardened AlZn alloy with elliptical G. P. zones. Experiments were carried out at constant strain amplitude, room temperature and frequency 2 Hz. The discussion focused on the role and relative importance of grain boundaries, extrusions and coarse slip bands for crack nucleation and propagation. Precipitation free zones bordering the grain boundaries are the most favoured sites of crack nucleation and early crack growth. The prevailing mechanism of the initial stage of transcrystalline cracking is alternating slip or shear. The large cracks with an extended plastic zone tend to follow the extrusions which are formed at the crack tip after sufficients number of cycles.
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The authors wish to thank Dr. P. Lukáš of Institute of Physical Metallurgy, Brno, for valuable comments on this work and to Mr. T. Páv, Nuclear Research Institute, Řež, for conducting the fatigue tests.
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Bartuška, P., Kratochvíl, J. & Šima, V. Low cycle fatigue cracking of Al 20wt% Zn multicrystals. Czech J Phys 37, 619–624 (1987). https://doi.org/10.1007/BF01597191
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DOI: https://doi.org/10.1007/BF01597191