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Pressure effects for crystal growth in a closed system
1Dipartimento di Fisica, Universitá di Camerino, and Istituto Nazionale di Fisica della Materia, Via Madonna delle Carceri, I-62032 Camerino, Italy.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 5, 2004
Summary
Crystal growth from supercooled liquid is hindered by increasing pressure due to density changes. This pressure affects crystal growth dynamics and morphological instability, simulated using a phase-field model.
Area of Science:
- Materials Science
- Physics
- Chemical Engineering
Background:
- Crystal growth from a supercooled liquid is a fundamental process in materials science.
- Density differences between solid and liquid phases can influence growth dynamics.
- Constrained growth environments introduce unique physical challenges.
Purpose of the Study:
- To analyze crystal growth under constrained conditions with varying densities.
- To investigate the impact of increasing pressure on crystal growth dynamics.
- To simulate and understand the effects on coexistence temperature and supercooling.
Main Methods:
- Utilized a modified two-dimensional phase-field model for simulation.
- Analyzed spherical and dendritic crystal growth patterns.
- Quantified interface temperature, tip velocity, and tip radius changes.
Main Results:
- Observed instantaneous interface temperature response to coexistence temperature changes in spherical growth.
- Identified a relaxation time for dendritic growth parameters, followed by lag-free pressure response.
- Noted a slight anticipation in the onset of morphological instability compared to free growth.
Conclusions:
- Increasing pressure due to density changes significantly impacts crystal growth.
- Dendritic growth dynamics adapt to pressure changes after an initial transient.
- Constrained growth conditions alter morphological instability onset.