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Related Experiment Videos

Adiabatic hypercooling of binary melts

Brattkus1

  • 1Department of Mathematics, Southern Methodist University, Dallas, Texas 75275-0156, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
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Hypercooled melts exhibit delayed morphological transitions due to latent heat release. This adiabatic process can even annihilate instabilities, leading to microstructure coarsening in binary alloys.

Area of Science:

  • Materials Science
  • Physics
  • Thermodynamics

Background:

  • Hypercooling involves cooling a binary melt below its solidus.
  • Planar solidification fronts in the isothermal limit are prone to morphological instability below a critical velocity.
  • Latent heat release in the adiabatic limit influences interface velocity and stability.

Purpose of the Study:

  • To investigate the adiabatic limit of hypercooled binary melts.
  • To analyze the effect of latent heat accumulation on solidification front dynamics.
  • To explore the prediction of morphological transitions and microstructure evolution.

Main Methods:

  • Modeling the hypercooled interface evolution using a damped Kuramoto-Sivashinsky (dKS) equation.
  • Analyzing the dKS equation with time-varying coefficients as the interface decelerates.

Related Experiment Videos

  • Examining the impact of latent heat of fusion on instability annihilation.

    • Main Results:

    • Morphological transitions are delayed based on system stability time and damping magnitude.
    • Sufficient latent heat of fusion can completely annihilate long-wavelength morphological instabilities.
    • The adiabatic dKS equation predicts late-stage coarsening with length scales proportional to t(1/2).

    Conclusions:

    • Adiabatic conditions significantly alter hypercooled solidification dynamics compared to isothermal conditions.
    • Latent heat plays a crucial role in stabilizing the solidification front and preventing morphological instabilities.
    • Coarsening dynamics in finite systems effectively eliminate morphological instabilities, leading to a refined microstructure.