Evidence for a transition from diffusion-controlled to thermally controlled solidification in metallic alloys
- 1 March 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (9), 5019-5022
- https://doi.org/10.1103/physrevb.45.5019
Abstract
Dendrite growth velocities have been measured as a function of undercooling in droplets of dilute alloys of B in Ni undercooled by up to 306 K using an electromagnetic levitation technique. At a critical undercooling, depending strongly on the B concentration, a steep rise of the dendrite growth velocity is observed. The analysis of the results within current theories of dendrite growth gives evidence for a transition from diffusion-limited to purely thermally controlled growth with partitionless solidification as a consequence.Keywords
This publication has 16 references indexed in Scilit:
- Theory for the trapping of disorder and solute in intermetallic phases by rapid solidificationActa Metallurgica, 1989
- Directional solidification: Transition from cells to dendritesPhysical Review Letters, 1989
- Evolution of the Dendritic Instability in Solidifying SuccinonitrilePhysical Review Letters, 1988
- Measurements of ultrarapid solidification rates in greatly undercooled bulk melts with a high speed photosensing deviceMaterials Science and Engineering, 1988
- Effect of growth rate dependent partition coefficient on the dendritic growth in undercooled meltsActa Metallurgica, 1987
- Rapid dendrite growth in undercooled alloysActa Metallurgica, 1987
- Solute Trapping in Silicon by Lateral Motion of {111} LedgesPhysical Review Letters, 1986
- Solute Trapping: Comparison of Theory with ExperimentPhysical Review Letters, 1986
- Mechanisms of microsegregation-free solidificationMaterials Science and Engineering, 1984
- Model for solute redistribution during rapid solidificationJournal of Applied Physics, 1982