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A recently developed criterion to predict the rafting, or anisotropic coarsening of the gamma-gamma' microstructure, in nickel-base single crystal super alloys is described. The simple criterion is based on the anisotropy of the energy associated with the gamma-gamma' interfacial mismatch dislocations, which is caused by the application of stress to the system. It also includes the external load and temperature dependence. Monte Carlo simulations incorporating the anisotropic growth by means of the new criterion compare successfully with rafting behaviour observed during creep tests.

Additional information

Authors: ARRELL D J, JRC Petten (NL);VALLÉS J L, JRC Petten (NL)
Bibliographic Reference: Paper presented: Localized Damage 94, Udine (IT), June 21-23, 1994
Availability: Available from (1) as Paper EN 38214 ORA
Record Number: 199411402 / Last updated on: 1994-12-06
Original language: en
Available languages: en