Abstract
The structure evolution of bicrystal (BC) samples during directional solidification (DS) was explored in an attempt to understand the mechanism of competitive grain growth. It was found that in the case of diverging dendrites the favorably oriented grain overgrows the misaligned grain. However, in the case of converging dendrites the result differs from the prediction of the generally accepted model for competitive grain growth. First, the unfavorably oriented dendrites are able to overgrow the favorably oriented dendrites. Second, the misaligned grain overgrows the favorably oriented grain by blocking the dendrites of the favorably oriented grain at the grain boundary. Based on the experimental results, the process by which a favored [0 0 1] texture is developed during DS process of a nickel-base super-alloy is illustrated. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Original language | English |
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Pages (from-to) | 2631-2637 |
Number of pages | 7 |
Journal | Acta Materialia |
Volume | 56 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1 Jun 2008 |
Keywords
- nickel alloys
- directional solidification
- theory
- grain growth