Transition in Mode of Cracking and Effect of Cold Reduction on Stress Corrosion Cracking in Copper-Manganese Alloys

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Abstract
Effect of cold reduction on the stress corrosion behavior of copper-manganese alloys in the range of 7 to 23% manganese has been studied using Mattsson's solution as the corrosive medium. In the annealed state, an alloy containing 7% manganese cracks intergranularly while the alloys containing 16% and 23% manganese crack transgranularly. Prior cold working increases the resistance to cracking of the Cu-7% Mn alloy while in the other two alloys, the susceptibility goes through a maximum. The results have been explained in the light of mechanochemical effects. Studies on dislocation distribution in some alloys within the same compositional range have been made and correlated with the stress corrosion observations.

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