Abstract
This chapter presents the present state of the film-induced cleavage (FIC) model using data on thin wires and foils of noble-metal alloys subject to surface dealloying. The “classical” film-induced fracture experiment uses normally processed material and produces an intergranular fracture. A surprising result was obtained in experiments where the samples were stressed lightly during dealloying, initially just to keep them straight. In 17 experiments, 14 spontaneous intergranular fractures were obtained at stresses of 5 to 15 MPa. Sometimes the fracture surface was entirely brittle, while some samples showed a combination of intergranular fracture and ductile tearing. In no case was the dealloyed layer thickness more than 10% of the reduced section thickness. The depth of dealloying was clearly visible on all fracture surfaces. A further 19 experiments were carried out on similar samples with a slower rate of dealloying. 14 samples failed by sudden intergranular fracture at reduced-section stresses of 2 to 21 MPa and dealloyed layer thicknesses of 0.4 to 2.7 μm. The amount of load seemed to have little effect on the time to fracture.
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