Abstract
Since 1990, it has been gradually understood that there exists an allowable range of cellular/dendritic spacings during unidirectional solidification. The lower and upper limits of the allowable range are very sharp at the same current growth condition, while the average spacing for cellular/dendritic arrays depends on the history of variation of solidification parameters. The present work puts forward a novel numerical model to predict the ultimate average spacing for constrained cellular and dendritic growth, according to the characteristics of unsteady-state evolution of cellular and dendritic arrays. Our analysis considering the history-dependent selection of the average spacing for cellular/dendritic arrays, we find - with no adjustable parameters - good agreement with experimental results obtained in different alloys and in different velocity histories.
| Original language | English |
|---|---|
| Pages (from-to) | 281-288 |
| Number of pages | 8 |
| Journal | Journal of Crystal Growth |
| Volume | 177 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Jun 1997 |
Keywords
- Average spacing
- Cellular/dendritic growth
- Numerical model
- Unidirectional solidification