Dissolution of eutectic microstructures
Technical Report
·
OSTI ID:40658
Literature review of microstructural development during melting revealed comprehensive work on interface stability but only observations of two-phase melting, including eutectic systems, with no analytical work. Four analytical models were developed to establish the role of solute diffusion and surface energy on morphology of a directionally melted lamellar eutectic. First, a mass balance of solute provided solute profile equations for the cases of no diffusion and complete diffusion in the liquid. Second, an energy balance at the interface provided separate equations for the average mp of each phase vs velocity, lamellar spacing, and material constants. Third, the diffusion equation was solved for a planar melting interface (solving for the average temperature of interface and combining with solute profile allowed solution of interface shape). Finally, a balance of the normal solute flux at the interface was used to examine the relation between interface morphology and solute diffusion in the liquid and solid. Experiments were conducted using a transparent organic lamellar eutectic alloy in which the melting interface could be observed in-situ. Steady-state interface morphologies were compared with predictions of solution of diffusion equation. Most experiments fitted the predicted morphologies, with exceptions where diffusive coupling was not maintained and a nonisothermal, nonplanar interface resulted. Experiment also revealed interface instabilities, including brief periods of a single phase planar interface and a Rayleighian instability for the nonplanar morphologies.
- Research Organization:
- Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 40658
- Report Number(s):
- IS-T--1718; ON: DE95010244
- Country of Publication:
- United States
- Language:
- English
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