Abstract
The influence of sintering temperature on the pore morphology, microstructure, and fatigue behaviour of a MoNiCu alloy is presented. Besides pore area, shape factors for bulkiness, elongation, and roughness of the pores were determined. Energy dispersive spectroscopy X-ray analyses were used to examine the distribution of alloying elements in the bulk of the material. Cyclic stress-strain, cyclic stress-temperature, and cyclic stress-electrical resistance responses were studied simultaneously to obtain a more comprehensive description of the fatigue behaviour. With increasing sintering temperature the pores are larger and more regular and, owing to a more homogeneous distribution of alloying elements, the solid solution hardening is more pronounced. Nevertheless, there is only a slight increase in the endurance limit. The higher sintering temperature leads to lower plastic strain amplitudes, temperature, and electrical resistance changes. This corresponds to less pronounced slip features at a lower density. The energy equivalent exponent and the temperature/electrical resistance ratio reveal the less homogeneous deformation state and the higher crack sensitivity of this material. PM/0787
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