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Grain boundary sliding is an important deformation process during high-temperature creep. Sliding often makes a significant contribution to the total creep strain of the specimen and, in addition, the sliding process is important in the nucleation, growth, and subsequent linkage of intergranular cavities.
The various theoretical deformation models for grain boundary sliding are reviewed, and it is shown that they fall into two groups depending on whether they relate to intrinsic sliding or to sliding with an associated accommodation process. Published experimental data on grain boundary sliding are tabulated for a number of different metals for comparison with the theoretical models, and the data are supplemented with recent results obtained on aluminum. It is demonstrated that all the available models lead to predictions which are inconsistent with one or more of the trends observed experimentally.
grain boundary sliding, creep
Professor, University of Southern California, Los Angeles, Calif.
Manufacturing Technology Specialist, Aircraft Group-Manufacturing Technology, Northrop Corporation, Hawthorne, Calif.