Cyclic stress–strain response and low-cycle fatigue damage in ultrafine grained copper
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We report on the fatigue behavior of ultrafine grained (UFG) copper obtained by equal channel angular extrusion (ECAE). Cyclic stress-strain response and fatigue life data were determined in fatigue tests conducted in the low-cycle fatigue (LCF) regime. The early stages of the fatigue process were examined in a scanning electron microscope equipped with a small-scale load frame that allowed for in situ fatigue observations. The ECAE route 16E gives superior fatigue performances as it provides for stable cyclic stress-strain response and more homogeneous plastic deformation than routes that are composed of lower number of ECAE passes. Still, the in situ fatigue tests indicated that fatigue damage occurs on a very localized scale, and thus, additional strengthening mechanisms need to be exploited to obtain UFG materials that display enhanced microstructural stability. © 2005 Elsevier B.V. All rights reserved.
author list (cited authors)
Maier, H. J., Gabor, P., & Karaman, I.