Analyses of thermal expansion behavior of intergranular two-phase composites |
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Authors: | C H Hsueh P F Becher E Y Sun |
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Affiliation: | (1) Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6068, USA |
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Abstract: | Both analytical modeling and numerical simulations were performed to analyze residual thermal stresses and coefficients of thermal expansion (CTEs) of intergranular two-phase composites in a two-dimensional sense. A composite-circle model was adopted for analytical modeling. Model microstructures consisting of square-array, hexagon-array, and brick wall-array of grains with an intergranular phase as well as an actual microstructure of random-array grains with an intergranular phase were adopted for numerical simulations. The results showed that in predicting CTEs, the simple analytical model represents the two-dimensional composite well except that with brick wall-array grains, which induced significant anisotropic CTEs in the composite. The residual thermal stresses in composites were also discussed. |
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