Abstract
Fully ordered and disordered Cu 3Au single crystals were cycled to fracture in tension-compression under strain control over a wide range of fatigue life. The fully ordered crystals exhibited an initial rapid fatigue hardening followed by softening. The disordered crystals showed continuous fatigue hardening until fracture. Fatigue hardening is interpreted by the unidirectional hardening concepts and softening by disordering. For both fully ordered and disordered crystals, deformation bands developed during fatigue hardening for all strain amplitudes investigated. Fatigue cracks were observed to initiate at the intersection of slip bands and deformation bands and then propagate along the deformation band boundaries. Order had little effect on the fracture mode and both fully ordered and disordered crystals showed ductile fracture features.
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