Physical mechanism of grain refinement in solidification of undercooled melts
Journal Article
·
· Physical Review Letters; (United States)
- Institut fuer Raumsimulation, Deutsche Forschungsanstalt fuer Luft- und Raumfahrt, D-51140 Koeln (Germany) Physics Department, Northeastern University, Boston, Massachusetts 02115 (United States)
It is proposed that the widely observed transitions in solidification of undercooled melts from a coarse grained dendritic to a grain refined equiaxed microstructure result from the fragmentation of dendrites by remelting during the period following recalescence where the inter-dendritic melt solidifies. This mechanism is supported by the experimental demonstration in Cu-Ni alloys that the transition undercoolings vary with cooling rate in a way which is relatively well described quantitatively by a simple fragmentation model. The latter also predicts the occurrence of two transitions, both of which are observed.
- DOE Contract Number:
- FG02-92ER45471
- OSTI ID:
- 6961180
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 73:10; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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