STRESS-CORROSION CRACKING OF COPPER-GOLD SINGLE CRYSTALS
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The stress-corrosion susceptibility range of the copper-gold system was measured, using single crystals loaded to give 5 glide strain in 2 ferric chloride. Alloys containing less than about 10 at. gold fail by the progressive reduction of cross section due to general corrosive attack. Alloys containing between 10 and 29 at. gold fail by stress corrosion, with the stress-corrosion susceptibility steadily increasing up to 29 at. gold. Those alloys containing in excess of this gold content are not susceptible to stress-corrosion. The stress corrosion behavior of Cu3Au is independent of structure short-range- order, long-range-order, or domain size and therefore independent of effects related to structure yield points, slip line clusters, etc.. The results are discussed in relation to current theories of stress-corrosion, and it is concluded that these are inadequate to account for the observations.
- Metallurgy and Metallography