Microstructure evolution of a [011] orientation single crystal nickel-base superalloy during tensile creep

Microstructure of [011] oriented single crystal nickel-base superalloy consists of the cubical gamma' phase embedded coherently in the gamma matrix, and arranged regularly along aOE (c) 100 > orientations. After tensile creep, the cubical gamma' phase in the alloy is transformed into the strip-like rafted structure along [001] direction under the ordering transformation free-energy and strain energy change. And the directional growing of gamma' phase is attributed to the atoms Al and Ta into (001) plane to form the stable stacking mode.