Mechanisms of environmentally assisted cracking are critically reviewed with an emphasis on environmentally induced cleavage-like cracking in systems where hydrides are not formed at crack tips. An adsorption-induced localised-slip model, first proposed by the present author, is reviewed in particular. Misconceptions and misunderstandings which have arisen regarding this model, modifications to the original model, and how it fits into the spectrum of environmental cracking mechanisms are discussed.
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