Abstract
The same portion of a stress corrosion crack in a Ni-16.5 at. pct Au alloy was examined by light microscopy and in the electron microscope at 800 and 100 kv. It was observed that the fracture propagates through a mechanically weak corrosion sponge which nucleates at slip steps created during exposure to the stress corrosion environment. The sponge is composed of a high density of branching corrosion tunnels with an average diameter of 70 to 90A and containing small particles of gold. A mechanism is proposed to account for the stability of corrosion tunnels in alloys whose components dissolve at different rates and it is predicted that under certain conditions corrosion crevices may become stable. No cracks were observed to propagate beyond the corrosion sponge into the unattacked alloy.
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