STRESS-CORROSION CRACKING OF COPPER-GOLD SINGLE CRYSTALS

摘要

The stress-corrosion susceptibility range of the copper-gold system has been measured, using single crystals loaded to give 5 per cent glide strain in 2 per cent 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 bataeen 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 Gu3Au 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.