Abstract
Diffusional creep can be inhibited by the presence of second phase particles on grain boundaries. This inhibition is discussed in terms of the limitation of grain boundaries as vacancy sources and sinks by particles. If vacancies condense on particle-free regions of a boundary then stress is concentrated at particles. This stress concentration can be relieved if defect loops nucleate and grow in the particle/matrix interface. Since the ease of nucleation will depend upon the line energy of the defect and this in turn will depend on the shear modulus of the particle, it is predicted that elastically hard particles will be most effective in inhibiting diffusional creep. This model is developed and its predictions are compared with reported experimental observations.
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