Abstract
The high cycle fatigue properties of the spinodal alloy Cu-10wt.%Ni-6wt.%Sn were studied in the alloy after quenching and following aging for 15 min at 350 °C. It was shown by X-ray diffraction and transmission electron microscopy that the demodulation of the composition waves, which causes cyclic softening in low cycle fatigue, does not occur on cycling below the yield stress. However, the dislocations in decomposed CuNiSn are localized in extensive pile-ups on a few widely spaced slip planes. Like many precipitation-hardened alloys, composition-modulated CuNiSn has a relatively low fatigue ratio and fatigue lifetime.
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