| Autor: |
Suzuki, M., Piccone, T. J., Flemings, M. C., Brody, H. D. |
| Zdroj: |
Metallurgical and Materials Transactions A; November 1991, Vol. 22 Issue: 11 p2761-2768, 8p |
| Abstrakt: |
Rapid solidification behavior of highly undercooled iron-phosphorus alloys was investigated by using a high-speed optical temperature measurement system. The experimental results on solidification rate as a function of bulk undercooling agree well with a model which includes a treatment of nonequilibrium effects during the solidification process. The model is based on an earlier analysis by Boettinger, Coriell, and Trivedi[81](BCT) and employs temperature-dependent values of equilibrium liquidus slope, equilibrium solute distribution coefficient, and solute interdiffusion coefficient. Values of the kinetic parameters,a0andV0, in the analysis which best fit the experimental results are 5 x 10-10m and 600 m/s, respectively. Comparison of experimental results and theory suggests that a transition from local equilibrium to nonequilibrium solidification takes place with increasing undercooling and that interface kinetic effects become predominant at higher undercooling (or growth velocity). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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