Abstract
The occurrence of river markings during sub-critical cracking of titanium alloys is discussed. The markings are attributed to a purely mechanical fracture process. It is suggested that a model of river marking formation in the presence of a cleavage can account for river marking formation during stress corrosion in aqueous and organic media, liquid mercury embrittlement, corrosion fatigue and sustained load cracking after prolonged cathodic polarisation in MeOH/HCl. In addition an attempt has been made to explain on a purely mechanical basis the formation of river markings during dynamic straining of specimens previously notched by intergranular dissolution, whether by anodic polarisation, stress corrosion or unstressed exposure in MeOH/HCl.
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