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Solute trapping and diffusionless solidification in a binary system.

Peter Galenko¹

¹German Aerospace Center, Institute of Materials Physics in Space, Cologne 51170, Germany. Peter.Galenko@dlr.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 13, 2007

Summary

This summary is machine-generated.

Rapid solidification of binary systems can form metastable phases due to complete solute trapping. A new model explains the transition from partitioned to diffusionless growth, validated with Si-As alloys.

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Area of Science:

Materials Science
Physical Chemistry
Solidification Science

Background:

Rapid solidification of binary alloys often results in metastable solid phases with the initial composition.
This phenomenon is attributed to complete solute trapping, leading to diffusionless (chemically partitionless) solidification at high crystal growth velocities.

Purpose of the Study:

To develop a comprehensive model for rapid solidification.
To describe the transition from chemically partitioned to diffusionless crystal growth.
To provide a theoretical framework explaining experimental observations in rapid solidification.

Main Methods:

Analytical treatment of solute diffusion around the solid-liquid interface.
Analysis of atomic attachment and detachment kinetics at the interface.
Development of flux balance equations incorporating interface and bulk diffusion speeds.

Main Results:

Derived the condition for complete solute trapping based on interface and bulk diffusion kinetics.
Introduced two key kinetic parameters: interface diffusion speed (VDI) and bulk diffusion speed (VD).
The model successfully describes experimental data for nonequilibrium solute partitioning in Si-As alloys across various solidification velocities.

Conclusions:

The developed model accurately captures the transition from partitioned to diffusionless growth during rapid solidification.
Complete solute trapping is a key mechanism governing metastable phase formation.
The model provides a robust explanation for experimental findings in systems like Si-As alloys.