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Abstract
The present study aims at clarifying the role of dislocation strengthening in fatigue of materials manufactured by severe plastic deformation (SPD) techniques. Employment of single crystals hardened via equal channel angular pressing (ECAP) helps to minimise or completely eliminate the effect of high angle boundaries on strengthening and fatigue behaviour. Both monotonic strength and high cycle fatigue (HCF) resistance were improved significantly after the first ECAP pressing, when low-angle dislocation configurations dominate in the microstructure. The essential role of dislocation accumulation during severe plastic deformation is highlighted for both tensile and fatigue strength (SPD). Dilute alloying of copper by silver stabilises the deformation microstructure and further improves the fatigue properties considerably.
Acknowledgements
The authors are indebted to Professor H. Miyamoto and Dr. D. Orlov for their interest in the present topic and fruitful discussions. Special thanks are due to Professor H. Mughrabi for useful discussions and critical comments. The help of M. Ueno with LCF experiments is appreciated. This study was financially supported by the Grant-in-Aid for Scientific Research on Innovative Area, “Bulk Nanostructured Metals”, through MEXT Japan (contract No. 22102006), and this support is gratefully appreciated. One of the authors (AV) wishes to thank the Russian Ministry of Education and Science for partial support of this research through the Grant-in-Aid No. 11.G34.31.0031.