Effect of dislocation hardening on monotonic and cyclic strength of severely deformed copper |
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| Authors: | A. Vinogradov M. Maruyama Y. Kaneko S. Hashimoto |
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| Affiliation: | 1. Department of Intelligent Materials Engineering , Osaka City University , Osaka 558-8585 , Japan alexei@imat.eng.osaka-cu.ac.jp;3. Department of Intelligent Materials Engineering , Osaka City University , Osaka 558-8585 , Japan |
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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. |
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| Keywords: | equal channel angular pressing fatigue copper electron backscattering diffraction dislocation structure |
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