Further observations of SCC in alpha-beta brass: Considerations regarding the appearance of crack arrest markings during SCC

Document Type


Publication Date



Department of Materials Science and Engineering


A series of constant displacement and constant extension rate SCC tests was performed on an alpha-beta brass alloy in 1 N Na2SO4 solutions. The chosen mechanical and electrochemical conditions resulted in predominantly transgranular, cleavage-like failure at high (≈8 to ≈50 μm· s•1) average crack propagation rates. Crack arrest markings were observed on selected transgranular facets which almost exclusively bordered regions of ductile overload failure. It is proposed that the observed crack velocities and the specific nature of the arrest mark appearance are most consistent with a cracking mechanism involving adsorption or some other interaction with a damaging environmental species.

Publication Title

Metallurgical Transactions A