Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9796274 | Materials Science and Engineering: A | 2005 | 15 Pages |
Abstract
The [0 0 1] tensile flow of a single-crystal superalloy (CMSX-4) having a high volume fraction of regularly-arrayed cuboidal γⲠprecipitates was simulated using a gradient-dependent plasticity model for the constitutive description of the γ-matrix. The simulated flow curves showed flow softening in the early stage of straining. Flow softening was accompanied by the organized catastrophic plastic flow of the γ-matrix, which resulted from the breakdown of the geometric (or kinematic) constraints imposed by the γ/γⲠmicrostructure. The flow-softening behavior was influenced by the thickness of γ-matrix channels (a volume fraction of the γⲠprecipitates), the flow property of the γ-matrix and the geometry of the γâ²-precipitate edge. In particular, changing the radius of the γâ²-precipitate edge resulted in a dramatic variations in the flow curves. The present unit-cell simulations exhibited good predictions for the γâ²-precipitate size dependence of the flow stress at moderate strains.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Y.S. Choi, T.A. Parthasarathy, D.M. Dimiduk, M.D. Uchic,