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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...
The superdislocations in the γ' phase of a fourth-generation single-crystal TMS-138 superalloy have been characterized after creep rupture at a stress of 137 MPa under different temperatures. The number of slip dislocations increases with the increase of creep temperatures from 1100 to 1150 o C. The dominant cutting mode of the γ' phase is dislocation pairs coupled by an antiphase boundary...
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