Webster and Piearcey found an activation energy for creep (∆Hc) of a nickel-base alloy which was twice that for self-diffusion (∆Hd) in nickel. They explained this by proposing that, as creep is controlled by the product of two terms, namely, dislocation velocity and density, which are themselves controlled by an activation energy equal to that for self-diffusion in nickel, the activation energy for creep will be twice that of the activation energy for self-diffusion in nickel.
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References
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GarofaloF., “Fundamentals of Creep and Creep Rupture in Metals”(Macmillan Series in Materials Science), p. 81. 1965: New York and London (Macmillan).
