Dislocation Configurations in Single-Crystal Superalloys during High-Temperature Low-Stress Creep

Abstract:

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Dislocation configurations in two single-crystal superalloys during high-temperature low-stress creep (1100°C, 137 MP) were illustrated schematically with the use of transmission electron microscope (TEM). For an alloy with a small lattice misfit, the dislocations move in the combination of climbing and gliding processes. In the primary stage, the dislocations first move by slip in the g-matrix channels. When they reach the g¢ cuboids, they move by climb along the g¢ cuboid surfaces. In the secondary creep stage, dislocation reorientation in the (001) interfacial planes happens slowly, deviating from the deposition orientation of <110> to the misfit orientation of <100>. For an alloy with a large lattice misfit, the dislocations are able to move smoothly by cross slip in the horizontal g channels. The dislocation reorientation from the deposition orientation of <110> to the misfit orientation of <100> in the (001) interfacial planes can be completed in the primary creep stage.

Info:

Periodical:

Advanced Materials Research (Volumes 306-307)

Edited by:

Shiquan Liu and Min Zuo

Pages:

433-437

DOI:

10.4028/www.scientific.net/AMR.306-307.433

Citation:

J. X. Zhang and H. Harada, "Dislocation Configurations in Single-Crystal Superalloys during High-Temperature Low-Stress Creep", Advanced Materials Research, Vols. 306-307, pp. 433-437, 2011

Online since:

August 2011

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Price:

$35.00

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