Abstract
Solid cadmium-induced cracking (SCIC) has been observed in titanium alloys and steels, and is a solid state analogue to liquid metal embrittlement. It is potentially inimical to titanium alloy utilization because titanium fasteners are cadmium plated to prevent galling, and aircraft structural parts of titanium alloys are usually assembled with cadmium plated steel fasteners.Unnotched cantilever bend bars of Ti-6A1-4V solution treated and aged to 150,000 psi yield strength were loaded at 300°F (148°C) to 85,000 psi and 185,000 psi nominal bending stress in air with cadmium, steel, copper, or zinc pressed into the tension surface. After 100-200 hours, specimens in contact with cadmium cracked 0.025-in. to 0.040-in., regardless of the nominal bending stress. Identical cracking occurred in vacuum annealed (dehydrogenated) specimens. None of the other contact metals caused cracking. Figure 1 shows the fracture surface of a cadmium-cracked specimen. The “thumbnail” cracks consisted mainly of intergranular cracking and transgranular cleavage (Fig. 2).
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