Abstract
This is a review of some concepts in the mechanics of fracture appropriate to interpreting atomistically brittle modes of cracking of crystal lattices and of interfaces between crystalline phases, especially in solids which are normally, or potentially, ductile. Crack tip modelling is first discussed based on elastic-brittle concepts, assuming either that there is no near-tip dislocation activity or, for the time being, neglecting it. That discussion brings out the importance of the Griffith condition and its generalization to a cracking interface (e.g., an embrittled grain boundary), and includes an account of the thermodynamics of interfacial decohesion in presence of (possibly embrittling) segregants. It is suggested that the phenomenology of grain boundary embrittlement by P and Sn in Fe, and of “cohesion enhancement” by C, can be at least partly understood as an effect of the various segregants on altering the work necessary to separate an interface against atomic cohesive forces.
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© 1987 Martinus Nijhoff Publishers, Dordrecht
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Rice, J.R. (1987). Mechanics of Brittle Cracking of Crystal Lattices and Interfaces. In: Latanision, R.M., Jones, R.H. (eds) Chemistry and Physics of Fracture. NATO ASI Series, vol 130. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3665-2_3
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DOI: https://doi.org/10.1007/978-94-009-3665-2_3
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