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Abstract
A model of creep in 〈001〉 oriented nickel-base superalloy single crystals applicable both for low and high temperatures has been developed. This model extends the preceding model of the present authors [Svoboda, J., Lukáš, P., Acta mater., 1997, 45, 125] covering only the case of low temperature creep.The present model takes into account five mechanisms, namely (i) dislocation slip in γ channels and concurrent multiplication of dislocations, (ii) dislocation slip in γ′ particles, (iii) dynamic recovery of the dislocation structure, (iv) morphological changes of γ′ particles by migration of γ/ γ′ interfaces and (v) coarsening of the rafted structure. The calculated creep curves were compared with the creep curves measured on single crystals CMSX-4 at 750°C and 1000°C; a good agreement was found.
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