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The development of dislocation configurations in two single-crystal superalloys during high-temperature low-stress creep (1100°C, 137 MPa) was investigated with the use of transmission electron microscopy. Detailed analysis showed that the lattice misfit has an important influence on the dislocation movement. For an alloy with a large negative lattice misfit, the dislocations are able to move smoothly...
There is an important relation between the γ/γ ' interfacial dislocations and the minimum creep rate. During creep (1100 o C, 137 MPa), the finer the interfacial dislocation networks are, the smaller the minimum creep rate is. This is attributed to the interaction between the γ/γ ' interfacial dislocations and slip dislocations in the γ matrix.
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